Write an interesting, riveting, action-packed, urban high fantasy supernatural harem romance story in the form of a crossover fanfic between the Overlord light novel, manga and visual novel franchise, the Seirei Gensouki light novel, manga and anime franchise, the IS: Infinte Stratos light novel, manga and anime franchise, the Mahouka Koukou no Rettousei light novel, manga and anime franchise, the Trinity Seven manga and anime franchise and the High School DxD light novel, manga, anime and video game franchise, in which Hyoudou Issei, the brown-haired [Issei] amber eyed [Issei] faux perverted [Issei] protagonist [Issei] of High School DxD who [what Issei is apart from being the protagonist of High School DxD] is [Issei] also the wielder of the Seikuriddo Gia [a Sacred Gear, an artefact |Seikuriddo Gia| with |what the Seikuriddo Gia has that makes it unique| powerful abilities |belonging to the Seikuriddo Gia| bestowed |upon the Seikuriddo Gia| upon it |the Seikuriddo Gia| by |the divinity that bestowed powerful abilities upon the Seikuriddo Gia| God as |the reason why God bestowed powerful abilities upon the Seikuriddo Gia| part of |the reason why God bestowed powerful abilities upon the Seikuriddo Gia| his |God's| system to |what God bestowed powerful abilities upon the Seikuriddo Gia to do| enact miracles |the Seikuriddo Gia| on Earth] Būsuteddo Gia, [Boosted Gear, a red gauntlet |Būsuteddo Gia| appearing |Būsuteddo Gia| like |what Būsuteddo Gia looks like| a dragon's front paw |Būsuteddo Gia| with |what Būsuteddo Gia has apart from being a red gauntlet that looks like a dragon's front paw| a large green gem in the middle |of Būsuteddo Gia| which |Būsuteddo Gia| boosts its |Būsuteddo Gia's| user's ability whenever the |current| user |of Būsuteddo Gia| requests so |to boost its current user's ability|], which [Būsuteddo Gia] contains [what Būsuteddo Gia contains as befitting its status as a Seikuriddo Gia] the soul of [the creature whose soul is contained with the Būsuteddo Gia Issei wields] the Sekiryūtei [Red Dragon Emperor] Y Ddraig Goch, [Y Ddraig Goch] the Red Dragon [Y Ddraig Goch] of [what Y Ddraig Goch is known as] Welsh Mythology and [what Y Ddraig Goch is known as apart from being the Red Dragon of Welsh mythology] Red Dragon Of Domination, [Issei being the wielder of the Seikuriddo Gia, Būsuteddo Gia which |Būsuteddo Gia| boosts its |Būsuteddo Gia's| user's abilities whenever the user requests when summoned to use and contains the soul of the Red Dragon of Domination, Y Ddraig Goch inside it] unbeknownst to his [Issei's] classmates at [the school Issei attends] the prestigious [the school Issei attends] Ginsei Gakuen [Ginsei Private Academy], and [what Issei is apart from being the wielder of the Seikuriddo Gia Būsuteddo Gia which |Būsuteddo Gia| boosts its |Būsuteddo Gia's| user's abilities whenever the user requests when summoned to use and contains the soul of the Red Dragon of Domination, Y Ddraig Goch inside it which his classmates at Ginsei are clueless about] the pawn [Issei] of [the person whom Issei is a pawn of] the high class [the person whom Issei is a pawn of] devil and [what the person whom Issei is a pawn of apart from being a high class devil] the princess [the person whom Issei is a pawn of] of [the entity or nation state the girl or woman Issei is a pawn of is a princess of] the House of Gremory which [the House of Gremory which the girl or woman Issei is a pawn of is a princess of] is [the House of Gremory which the girl or woman Issei is a pawn of is a princess of] one [the House of Gremory which the girl or woman Issei is a pawn of is a princess of] of [the group that the House of Gremory which the girl or woman Issei is a pawn of is a princess of belongs to] the Three Great Pillars of [the location where the Three Great Pillars that the that the House of Gremory which the girl or woman Issei is a pawn of is a princess of belongs to is located] the Underworld, [Issei's mistress who is a Princess of the House of Gremory which is one of the Three Great Pillars of the Underworld] the scarlet haired [Issei's mistress who is a Princess of the House of Gremory which is one of the Three Great Pillars of the Underworld] blue eyed, [Issei's mistress who is a Princess of the House of Gremory which is one of the Three Great Pillars of the Underworld], seductive [Issei's mistress who is a Princess of the House of Gremory which is one of the Three Great Pillars of the Underworld], tall [Issei's mistress who is a Princess of the House of Gremory which is one of the Three Great Pillars of the Underworld] and [Issei's mistress who is a Princess of the House of Gremory which is one of the Three Great Pillars of the Underworld] buxom [Issei's mistress who is a Princess of the House of Gremory which is one of the Three Great Pillars of the Underworld] Rias Gremory [Issei's mistress who is a Princess of the House of Gremory which is one of the Three Great Pillars of the Underworld], who [Rias] is [Rias] also [what Rias is to Issei apart from being his mistress] his [Issei's] fiancée [Rias] and [what Rias is apart from being the Princess of the House of Gremory who is Issei's mistress and fiancée] his [Issei's] English teacher [Rias], [Issei being the wielder of the Seikuriddo Gia Būsuteddo Gia which boosts its user's abilities whenever the user requests when summoned to use and contains the soul of the Red Dragon of Domination, Y Ddraig Goch inside it, as well as being the pawn of the Princess of the House of Gremory, his English teacher Rias Gremory, which his classmates at Ginsei are clueless about]  [Issei] is [Issei] in fact [Issei's true identity] Suzuki Satoru [Issei's true identity] , [Issei's true identity as Suzuki Satoru] a black haired [Satoru], blue-eyed [Satoru] part Japanese aristocratic [Satoru], half-Anglo-Slavic-Nordic American commoner [Satoru] salaryman [Satoru] who [Satoru before the transmigration of his |Satoru's| soul into Issei's body] was [what Satoru did for a living before the transmigration of his |Satoru's| soul into Issei's body] a salaryman with [Satoru's level of education before he became a salaryman and was subsequently transmigrated into Issei's body] a college level education who [Satoru before the transmigration of his |Satoru's| soul into Issei's body] lived a miserable life in [where Satoru lived before the transmigration of his |Satoru's| soul into Issei's body] the Japanese colony of Pacifica, [the Japanese colony of Pacifica where Satoru lived before the transmigration of his |Satoru's| soul into Issei's body] located on [the geographical location of the Japanese colony of Pacifica where Satoru lived before the transmigration of his |Satoru's| soul into Issei's body] the West Coast of the former United States and Canada, [Satoru living a miserable life as a salaryman in the Japanese colony of Pacifica before the transmigration of his |Satoru's| soul into Issei's body] due to his [Satoru's] guilt over [the traumatic event that caused Satoru to live a miserable life as a a salaryman in the Japanese colony of Pacifica before the transmigration of his |Satoru's| soul into Issei's body] the disapperance of [the person whose disapperance caused Satoru to live a miserable life as a a salaryman in the Japanese colony of Pacifica before the transmigration of his |Satoru's| soul into Issei's body out of immense guilt] his [Satoru's] 'childhood friend' [in the eyes of those in the government and law enforcement not in the know] and fiancee, [Satoru's childhood friend and fiancee whose disapperance caused Satoru to live a miserable life as a a salaryman in the Japanese colony of Pacifica before the transmigration of his |Satoru's| soul into Issei's body out of immense guilt] Ayase Miharu, who [Ayase] was [Ayase] a [what Ayase was] Yamato Nadeshiko [a traditional well mannered Japanese beauty] who [Ayase] had [Ayase's] long black hair and [Ayase's] dark purple eyes and was [Ayase] a soft and kindhearted girl who [Ayase] was [Ayase's personality] caring, honest and responsible and [what Ayase's personality was apart from being caring, honest and responsible] loyal, although she [Ayase] was [Ayase] also very shy [Ayase] and [Ayase] a bit too forgiving, [Ayase disappering and subsequently causing Satoru to live a miserable life as a a salaryman in the Japanese colony of Pacifica before the transmigration of his |Satoru's| soul into Issei's body out of immense guilt] when they [Satoru and Ayase] were [Satoru and Ayase] in high school, Satoru [due to his guilt about his 'childhood friend' and fiancee's Ayase's disapperance before the transmigration of his |Satoru's| soul into Issei's body] developing an rather deadly addiction to [the self destrutive habit Satoru did in his free time due to his guilt about his 'childhood friend' and fiancee's Ayase's disapperance before the transmigration of his |Satoru's| soul into Issei's body] virtual reality gaming, [Satoru due to him developing a rather deadly addiction to gaming due to his guilt about his 'childhood friend' and fiancee's Ayase's disapperance before the transmigration of his |Satoru's| soul into Issei's body] becoming a rather past master at [the virtual reality game Satoru masters due to him developing a rather deadly addiction to gaming due to his guilt about his 'childhood friend' and fiancee's Ayase's disapperance before the transmigration of his |Satoru's| soul into Issei's body] YGGDRASIL, which [YGGDRASIL] was [the type of virtual reality game YGGDRASIL was] a DMMO-RPG [Dive Massively Multiplayer Online Role Playing Game], which [a DMMO-RPG] was [the definition of a DMMO-RPG]  the type of game [a DMMO-RPG]. that [what a DMMO-RPG allows its players to do]. allowed [a DMMO-RPG] its [a DMMO-RPG's] players to [what a DMMO-RPG allows its players to do] enter [what a DMMO-RPG allows its players to enter during gameplay] a virtual world and [what a DMMO-RPG allows its players to do after entering a virtual world during gameplay] experience it [the virtual world a DMMO-RPG allows its players to enter during gameplay] as though it [the virtual world a DMMO-RPG allows its players to enter during gameplay] were [the status of the virtual world a DMMO-RPG allows its players to enter during gameplay] real life, [Satoru mastering the DMMO-RPG YGGDRASIL, a type of game that allowed one to enter a virtual world and experience it as though it were real life, due to his guilt about his 'childhood friend' and fiancee's Ayase's disappearance before the transmigration of his |Satoru's| soul into Issei's body] the guilt ridden young man [Satoru] becoming [the player class and species Satoru choose to play as in YGGDRASIL as he mastered the game due to his guilt about his 'childhood friend' and fiancee's Ayase's disappearance before the transmigration of his |Satoru's| soul into Issei's body] a Overlord-class [a high-tier heteromorphic race that was skilled in magic, chronokinesis |time manipulation| and could command an army of lesser undead |zombies, vampires, reanimated skeletons| within the game world of YGGDRASIL], Elder Litch [a powerful undead magic caster existing within the game world of YGGDRASIL as a reanimated skeleton, capable of commanding lesser undead |zombies, vampires, reanimated skeletons| with his or her necromancy |the ability to revive the dead as zombies or skeletons via magic and manipulate darkness itself| and casting highly destructive magic |within the game world of YGGDRASIL|], [Satoru as he masters YGGDRASIL as a Overlord-class Elder Litch due to due to his guilt about his 'childhood friend' and fiancee's Ayase's disappearance before the transmigration of his |Satoru's| soul into Issei's body] becoming [Satoru] quite feared [Satoru's persona as a Overlord-class Elder Litch within YGGDRASIL] within the game [YGGDRASIL] as [what Satoru's persona as a Overlord-class Elder Litch within YGGDRASIL is feared as within the game] Momonoga [Satoru's persona as a Overlord-class Elder Litch within YGGDRASIL], [the role of Momonga within YGGDRASIL] the guildmaster [the role of Momonga within YGGDRASIL] of [the guild Momonga is a guildmaster of within YGGDRASIL] Ainz Ooal Gown [one of the top Guilds of YGGDRASIL which |Ainz Ooal Gown| consisted only of productive members of society within real life, which |Ainz Ooal Gown| rose to prominence through the excessive purchase of cash items and possession of rare relics], although the game [YGGDRASIL] fell on hard times and [YGGDRASIL after running into financial difficulties] had to shut down, [YGGDRASIL falling on hard times and having to shut downas a result] leaving the legendary player [Momonga] alone [Momonga] near [the location Momonga is near in YGGDRASIL as the game prepares to shut down] the guild hall [of Ainz Ooal Gown], [Momonga as he is near the guild hall of Ainz Ooal Gown as YGGDRASIL prepares to shut down due to the game falling on hard times] brooding about his friends [his guildmates within Ainz Ooal Gown] and what will happen [to his real life self Suzuki Satoru] now that the game [YGGDRASIL] is [YGGDRASIL] shutting down. [Momonoga brooding about his friends and what will happen to his true self in real life now that the game is shutting down near the guild hall of Ainz Ooal Gown] before a strange sensation overtakes him [Momonga] and [Momonga after the strange sensation overtakes him] he [Momonga after the strange sensation overtakes him] wakes up [Momonga after the strange sensation overtakes him] in [where Momonga is after the strange sensation overtakes him] the body of [the person whose body Momonga is now possessing in/residing in, or to be more specific, the person Momonga has become after the strange sensation overtakes him] a twelve-year-old Issei  [the person whose body Momonga is now possessing in/residing in, or to be more specific, the person Momonga has become after the strange sensation overtakes him], who [Issei before Momonga took over his body and merged with his |Issei's| soul] was [Issei before Momonga took over his body and merged with his |Issei's| soul] preparing [what Issei was planning to do before Momonga took over his body and merged with his |Issei's| soul] for [what Issei was planning to do before Momonga took over his body and merged with his |Issei's| soul] his [Issei's] first day of middle school, [Momonga as he woke up in a twelve year old Issei's body after Issei fell asleep on the last day of summer] being freaked out by the experience [that he is basically a young boy again due to the unexpected method of his reincarnation] but [Momonga] being [Momonga] relieved that [what Momonga does after he realises that he is basically young again] he [Momonga] got [what Momonga got by becoming Issei] a second chance at life [as Issei].   Continue exactly where this left off from....I like where this is going. Since Issei was an otaku [someone who loves anime, manga, J-RPGs and other Japanese pop culture things] and [what Issei was apart from being a otaku before Momonga merged with his soul and took over his body] part-time NEET/hikkimori [someone who is socially reclusive and addicted to anime, manga, J-RPGs and other Japanese pop culture things and is afraid to go outside] before Momonga merged with [what Momonga merged with] his [Issei's] soul and [Momonga after merging with Issei's soul] took over [what Momonga took over after merging with Issei's soul] his [Issei's body], [Issei being a otaku and part time NEET/hikkimori before Momonga merged with his soul and took over his body], I have a feeling that this [Issei being a otaku and part time NEET/hikkimori before Momonga merged with his soul and took over his body] will amuse 'Issei' somewhat, [Issei being a otaku and part time NEET/hikkimori before Momonga merged with his soul and took over his body] as he [Issei] prepares to head to school.  Awesome! I have the feeling that 'Issei' is [what 'Issei' is going to do] going to be [what 'Issei' is going to be] very surprised when he ['Issei'] finds out that he ['Issei'] has [what 'Issei' has that is going to make him very surprised] all of his [Momonga's] spells, abilities, powers and even items that he [Momonga] obtained from [where Momonga would have all of his spells, abilities, powers and even items] his [Momonga's] time as [what Momonga was] an Overlord-class Elder Litch in [the location where Momonga was an Overlord-class Elder Litch in] YGGDRASIL, ['Issei' being surprised that he has all of his spells, abilities, powers and even items from Momonga's time as a an Overlord-class Elder Litch in YGGDRASIL] when he ['Issei'] is ['Issei'] heading to [where 'Issei' is going] school. Great. I have the feeling that Issei will keep his ['Issei''s] powers [Momonga's spells, abilities, powers and even items from Momonga's time as an Overlord-class Elder Litch in YGGDRASIL] a secret, ['Issei' keeping his powers a secret] because he ['Issei'] is ['Issei'] still paranoid and also because he ['Issei'] wants a fresh start as a normal human, free from his [Satoru's] guilt of [what Satoru feels guilty about] being unable to [what Satoru feels guilty about being unable to do] protect his [Satoru's] one true love [Ayase].  Why do I have the feeling that 'Issei' will ['Issei'] still be seen as [what 'Issei' will still be seen as in the public eye by his peers at school] a loner nerd [by his classmates and fellow students], [Issei still being seen as a loser nerd by his classmates and fellow students by his classmates and fellow students] even as he ['Issei'] enters middle school, [Issei still being seen as a loser nerd by his classmates and fellow students by his classmates and fellow students even as he enters middle school] but his ['Issei's] past life's [Satoru's] business skills and [Satoru's] negotiations will [what Satoru's business skills and negotiations will do to help 'Issei' as he enters middle school] help him ['Issei'] to ['Issei'] remain calm and also help him ['Issei'] to ['Issei'] get a social life.  Interesting. I also suspect that he ['Issei'] will ['Issei'] be [what Issei will be doing] training to [what 'Issei' will be training to do] master his ['Issei's'] newfound abilties [Momonga's spells, abilities, powers and even items from time as an Overlord-class Elder Litch in YGGDRASIL], ['Issei' training to master his newfound abilities] out of sight from the public or his ['Issei's'] family of course. Great. Though I suspect that he ['Issei'] will ['Issei'] use his ['Issei's'] powers [Momonga's speed, magical talent and vast mana |magical energy| pool, spells, abilities, powers and even items from his |'Issei's'| time as an Overlord-class Elder Litch in YGGDRASIL] in a more practical manner [read searching for Yakuza, Han Chinese triad and Russian Mafiya hideouts and treating said hideouts like RPG dungeons], [Issei using his powers in a more practical manner], making sure ['Issei'] to [what Issei makes sure to do when using his powers in a more practical manner] not go overboard [when testing out his powers in the field].  Cool. Why do I have a feeling that 'Issei' is going to use his [what the original Issei had before Momonga took over his body and merged with his soul] vast intelligence and genius mind and his [Momonga's/Satoru's] business acumen and [Momonga's/Satoru's] street-smart, go-getter mindset to [what 'Issei' is going to use his vast intelligence, genius mind, business acumen, street-smart and go-getter mindset to do] try and accumulate some money and influence [in Japan], ['Issei' using his vast intelligence, genius mind, business acumen, street-smart and go-getter mindset accumulate some money and influence] covertly, of course.  Neat, Neat. So our reincarnated Overlord ['Issei'] is ['Issei'] making plans for the future, ['Issei' making plans for the future] in secret of course. I like that. Just one thing....has he ['Issei'] made any lesser undead [Death Knights, lesser litches, zombies, vampires, reanimated corpses and enhanced humans] from [what 'Issei' would make lesser undead from if he has made any] the corpses of his victims [the members of the crime organizations he has covertly wiped out]?  Great...awesome. So he ['Issei'] is [what 'Issei' does] making moves in [where 'Issei' is making moves in] the [shady business and criminal] underworld, huh? Great!  Awesome! I like the way how 'Issei' is thinking...it seems like he ['Issei] is [what 'Issei' may or may not be doing] making big moves, both at school and in the underworld. What about the original Issei's childhood friends, [from before Momonga took over his |the original Issei's| body] the brown-haired, glasses-wearing, extreme otaku [a nerd who specializes in anime, manga and J-RPGS] Motohama and  [Motohama's friend apart from Issei] the bald-headed track star Matsuda, who [Matsuda and Motohama] are [what Matsuda and Motohama are] extreme perverts who [what Matsuda and Motohama do apart from being very perverted] have a specific love for perverted visual novels, light novels, anime, J-RPGs and manga?  Great...that's good to know. Well, thankfully....Momonoga wasn't a pervert [at least before he |Momonga| found himself |Momonga| in Issei's body] and 'Issei's' otaku lifestyle is thankfully more sensible than that of the original Issei [who |the original Issei| was |what the original Issei was doing before Momonga took over his body| only pretending |the original Issei| to be a pervert anyways], so he ['Issei'] will ['Issei'] have a quiet life in middle school, although he ['Issei'] will [what Issei may or may not do] write about his ['Issei's] past life's [Satoru's] experiences as Momonga within YGGDRASIL via [what 'Issei' will use to record Satoru's experiences as Momonga within YGGDRASIL] light novel format, [Issei writing a light novel based on Momonga's experiences within YGGDRASIL] under a pseudonym, of course. Why do I have the feeling that 'Issei's' light novel is [what is going to happen to 'Issei's' light novel] going to blow up [become really successful], earning him ['Issei'] quite a sizable profit that he ['Issei'] will be able to take under the radar.