Gaim Gaiden: Kamen Rider Zangetsu

is a Japanese superhero V-Cinema film that serves as the first installment of Kamen Rider Gaim Gaiden, set within the continuity of Kamen Rider Gaim. In the film, Takatora Kureshima reunites with a childhood friend while continuing his research on the Helheim Forest and discovers his father's dark past.
==Synopsis==
==Continuity and Placement==
*The film takes place immediately after the events of Episode 20.
==Plot==
The night after Takatora tells Kouta the truth of Helheim Forest and the decision to cut down several human populations, several Kurokage Troopers cleaning up Helheim vines that growing on the city but a mysterious figure from a Crack emerge and attacks them. The next day, Sid and Takatora checks on the crime scene and thinks if Kouta is the assailant despite him being warned. Returning to home, Mitsuzane shows Takatora of a guest that wanted to meet him, whom turned out to be the Kureshima family's former maid, Touka Akatsuki. She reunites with the siblings after six years to inform of their father's death.
Takatora flashes back to his childhood where he first meet Touka, and for once he enjoyed the apple pie she made despite its "horrible" taste, yet recalling the event during his dinner. At that same night, Sid walks into a dark alley, when an unknown figure attacks him. The next morning, the news reach Takatora as he meets Touka at the Yggdrasill Tower's parking lot, whom invites him to her place. Takatora is served with apple pie again, yet recalls the same taste but enjoys it nonetheless. While Touka and Takatora watches the view from balcony, a Helheim vine creeps out of their sight.
Yoko takes a walk into the Yggdrasill tower and notices a Helheim vine. Tracking its source into a power room, an unknown figure attacks her and transforms into an Armored Rider. Yoko transforms into Marika and tries to attack the perpetrator but it escapes into a Crack. Ryoma meets Takatora in his office and presents him the Watermelon Lockseed to compensate for the one he originally lost. With given information that the attacker is not a Beat Rider, but an affiliate of Yggdrasill, Takatora digs in through his father's books and finds horrifying secrets hidden by his father. Mitsuzane returns home and notices Helheim vines in his house, followed by the mysterious attacker again. Takatora tries to transform but his Melon Energy Lockseed gets stolen.
The next day, Takatora walks into the Zawame Child Development Institution and finds a hidden passage on the abandoned building, which turns out to be what it seems as a human experimentation facility. Cursing his late father for his inhumane acts, Takatora discovers an Elementary Inves but as he wishes to go further, the mysterious attacker appears again as he unmasks the figure as Touka. As revealed by Touka, the child development institution was a front for a human experiment facility, where children were experimented to become Yggdrasill employees. Touka was among the chosen ones and, sadly, those who were not lucky enough turned into Inves. She had killed Amagi Kureshima and sets her eyes on anyone related to Yggdrasill as revenge. She reveals the Ringo Lockseed and transforms into Armored Rider Idunn, but even as she attacks Takatora, he professes he has no regret about learning his father's true colors and strongly holds to the principles Noblesse Oblige. Takatora uses the Watermelon Lockseed and transforms into Zangetsu Watermelon Arms.
Despite being weakened by her guerrilla tactics, Zangetsu manages to stun Touka and retrieves the Melon Energy Lockseed in time to transform into Zangetsu Shin and turn the tables, but allows her to live. On the brink of mutating into an Inves, Touka questions her fate, lamenting Takatora being a Kureshima clan member. Ryoma appears, revealing the Lockseed as one of his first creations alongside the Yomotsuheguri Lockseed, coming with a deadly cost. Touka using the Lockseed indirectly helped Ryoma in his study to confirm the existence of Forbidden Fruit. Now no longer finding her useful, Ryoma transforms into Duke and kills her in cold blood.
Takatora thinks again of his prior conversation with Kouta about his choice to kill most of the world's population to allow the human race to survive. Before leaving for work, he views the dining table and recalls the happier times he had with Touka.
==Characters==
===Kamen Riders===
====Armored Riders====
Kamen Rider Zangetsu	Takatora Kureshima
====Genesis Armored Riders====
Kamen Rider Zangetsu Shin	Takatora Kureshima
Kamen Rider Duke 	Ryoma Sengoku
Kamen Rider Marika 	Yoko Minato
====Rider Troops====
Kurokage Troopers	Yggdrasill Henchmen
===Allies===
*Kouta Kazuraba
*Mitsuzane Kureshima
*Lock Dealer Sid
===Other characters===
*Amagi Kureshima
===Villains===
Kamen Rider Idunn	Touka Akatsuki
==Cast==
*: , 
*: 
*: 
*: 
*: , 
*: 
*: 
*: , 
===Suit Actors===
*Kamen Rider Zangetsu, Kamen Rider Zangetsu Shin: 
*Kamen Rider Duke: 
*Kamen Rider Marika: 
*Kamen Rider Idunn: 
==Lockseeds==
*Locks Used:
**Zangetsu (Shin):
***Watermelon, Melon Energy
**Kurokage Troopers:
***Matsubokkuri
**Idunn:
***Forbidden Ringo
**Duke:
***Lemon Energy
**Marika:
***Peach Energy
*Arms Changes:
**Zangetsu (Shin):
***Watermelon Arms, Melon Energy Arms
**Kurokage Troopers:
***Matsubokkuri Arms
**Idunn:
***Ringo Arms
**Duke:
***Lemon Energy Arms
**Marika:
***Peach Energy Arms
==Theme Song==
*Lights of My Wish by Yuumi Shida
==Errors==
*As Yoko transformed in order to fight Idunn, the sounds for the Energy Lockseed's opening up, her putting it in, or the "Soda" sound, are not heard, as she jumps right into Rider form.
*When Takatora puts the Watermelon Lockseed into his Driver, the Indicator's colors had already changed, as opposed to changing as he did the "Lock On" part.
**As the Watermelon Armor Part appeared above him, his Indicator had it's normal colors.
*As Takatora closed the Watermelon Lockseed, the "Lock Off" sound is heard, despite the fact he is not seen removing either his Sengoku Driver or the Lockseed.
==Notes==
*Closing Screen Lockseed Collection:
**Kamen Rider Zangetsu
***Kamen Rider: Zangetsu/Zangetsu Shin
***Lockseeds: ELS-04 Melon Energy, LS-TABOO Ringo, PROTO-10 Watermelon
*Due to this film have been shot after the main series' has concluded, there is an inconsistency in the hairstyle lengths of multiple characters in regards to the film's actual placement within the continuity of the series. 
*Takatora never uses Melon Arms, despite the form appearing on the DVD cover.
*There is no major connection between the Zangetsu and Baron Gaim Gaiden specials, except for the Ringo Lockseed in Touka's possession that later comes into the hands of Yggdrasill, who later gives it to Kaito. This indicates that Ryoma, who appeared towards the end of the film had acquired the Lockeed from Touka and had Yoko give it to Kaito.
*In earlier press tours for the film, Yuki Kubota implied sexual content between Takatora and Touka which was ultimately cut from the final version of the film.http://tokusatsunetwork.com/2015/01/yuki-kubota-kamen-rider-zangetsu-talks-gaim-v-cinema/.
==External links==
*Official website
==References==
Category:Kamen Rider Movies