Happy Devil Day (NB)

Happy Devil Day — sometimes shortened to "HDD" — is an anniversary celebration that takes place in the month of April, with a number of events, rewards, and updates happening in commemoration of the original release date of Nightbringer, April 12. There are also "Happy Devil Day .5" events during the month of October celebrating the half-anniversary of the game's release.
This page lists all of the events that took place during all past "Happy Devil Day" and "Happy Devil Day .5" celebrations, sorted from the newest anniversary to the oldest.
== Appreciation 2024 ==
* Special Nightmares Sweet Love of Mine! (NB) and A RADical Celebration! (NB) were released
** The cards in Sweet Love of Mine! do not have Devilgrams or chats
* Event Nightmares Tracing Christmas Memories 1 (NB) and Tracing Christmas Memories 2 (NB) were released
* A "Select" Nightmare was available
** Aiming for Your Heart! Vol. 2 featured a pool of 12 cards available from Lessons 41-60 of Ruri-Tunes that had Premium Pictures
* Two "Revival of the Demons" Nightmares were released
* The Celestial Blessing Pop Quiz Presenting Perfect Memories was released
* Three special Login Bonuses were available
** Thanks for the Memories 1 Login (NB) included phone calls from the seven brothers and Premium Pictures for Beelzebub and Solomon
** Thanks for the Memories 2 Login (NB) included phone calls from the five side characters and Premium Pictures for Leviathan, Satan, and Mammon, as well as a Lucifer UR+ Card
*** Lucifer's UR+ Card has a premium picture, but does not come with a Devilgram story or chats
** Presenting Perfect Memories Login (NB)
* Two Power Up Campaigns were available
** The first campaign applied to Demon Cards for Lucifer, Leviathan, Satan, Asmodeus, Diavolo, and Simeon that were SSR or higher
** The second campaign applied to Demon Cards for Mammon, Beelzebub, Belphegor, Barbatos, Luke, and Solomon that were SSR or higher
** Both campaigns applied to all Memory Cards SSR or higher, regardless of which characters were featured
* Special Sale sets were available
** Black Cyber Sale 2024 Round One
* New Dark Santa outfits were available for Mammon, Leviathan, Belphegor, Diavolo, Barbatos, and Simeon
* The "Animal Look" Outfits and "Onesie" Outfits originally from Obey Me! were available in Akuzon
* Other limited item outfits and Ruri★Tunes outfits from the past were also re-released
** Outfit sets included Chess, Vampire, Gakuran, Arabian, Noel, Carnival, and Hero
* Thank You Pictures were posted on official social media accounts
** Illustration of Lucifer, Mammon, and Leviathan
** Illustration of Satan and Asmodeus
** Illustration of Beelzebub and Belphegor
** Illustration of Diavolo and Barbatos
** Illustration of Luke, Simeon, and Solomon
** Illustration of Thirteen, Mephistopheles, and Raphael
** Messages from everyone
== Happy Devil Day .5 2024 ==
* Event Nightmares RAD Tournament Prep 1 (NB) and RAD Tournament Prep 2 (NB) were released
** Each Nightmare had one discounted x10 Summon each day during the event period
** The UR+ cards in the Nightmares include chats with a voice message
* Nightmares A Relaxing Time for Two Vol. 1 (NB) and A Relaxing Time for Two Vol. 2 (NB) were re-released
* The Celestial Blessing Pop Quiz Love and Sports: The RAD Tournament (NB) were released
* The "Select" Nightmare Aiming for Your Heart! was available
** With a "Select Ticket," players could summon a card of their choosing from a pool of the 12 UR+ cards with Shower Premium Pictures
* A special Login Bonus was available with a UR Memory Card as a reward
* A Charge Mission was released
* A Power Up Campaign was available
* Special Sale sets were available
* New songs The Seven Rulers and Waiting Kiss were released
** The songs were also be featured in Ruri★Tunes
* Characters received new "Sports" Outfits for Majolish and Battle
* The "Halloween" Outfits originally from Obey Me! were available in Akuzon
* Messages from the characters were posted on the official Twitter account
** Lucifer's message, Mammon's message, Leviathan's message, Satan's message, Asmodeus's message, Beelzebub's message, Belphegor's message
** Diavolo's message, Barbatos's message, Luke's message, Simeon's message, Solomon's message
** Thirteen's message, Mephistopheles's message, Raphael's message
== Happy Devil Day 2024 ==
* Event Nightmares Let's Get Ready to Party! Vol. 1 (NB) and Let's Get Ready to Party! Vol. 2 (NB) have been released
** Both Nightmares feature a free x10 summon once per day for 10 days, for a total of 200 free summons
* The Celestial Blessing Pop Quiz Revolution of the Stained Glass Flower (NB) has been released
** The Pop Quiz included four chapters
* During anniversary period, the AP Recovery Set Flash Sale will appear more often - approx. every 4 hours instead of the usual 12
* Two Pint-Sized Challenge Missions are available
** Revolution of the Stained Glass Flower Pint-Sized Challenge 1
** Revolution of the Stained Glass Flower Pint-Sized Challenge 2
* Two special Login Bonuses are available
** Happy Devil Day (2024) Login (NB)
** HDD2024 Exchange Ticket Login
* Happy Devil Day 2024 Super Charge Mission is available
* The Power Up Campaign sale happened twice
** The first sale was from April 10th to 14th, and the second sale was from April 22nd to 26th
* Special Sales sets are available
* "Nightbringer" outfits for Wanderers' Whereabouts have been released for all characters
** These outfits are exclusive to WW, and are worn by the characters around the house and during video calls
* Wanderers' Whereabouts "Handwritten Letter" limited-item is available for all characters
* "Virtuoso" Majolish Outfits have been added for all characters
* The new songs Anniversary and All the Feels are featured in Ruri★Tunes
* Messages from the characters were uploaded to official social accounts
** Lucifer's message, Mammon's message, Leviathan's message, Satan's message, Asmodeus's message, Beelzebub's message, Belphegor's message
** Diavolo's message, Barbatos's message, Luke's message, Simeon's message, Solomon's message
** Thirteen's message, Mephistopheles's message, Raphael's message
== Happy Devil Day .5 2023 ==
* Event Nightmares A Relaxing Time for Two Vol. 1 (NB) and A Relaxing Time for Two Vol. 2 (NB) were released
** The stamp card included "fabulous prizes", such as UR+ Demon Vouchers
* The Celestial Blessing Pop Quiz Trick or Treat! (NB) was released
** The Pop Quiz included four chapters
** Battle spaces that end in numbers in this Pop Quiz and future Pop Quizzes have a lower difficulty level
* During the time of the Pop Quiz, the AP Recovery Set Flash Sale appeared more often - approx. every 4 hours instead of the usual 12
* Two Pint-Sized Challenge Missions were available
** Trick or Treat! Pint-Sized Challenge 1
** Trick or Treat! Pint-Sized Challenge 2
* A special Login Bonus was available
* A Devildom Exchange Release Login Bonus was also available
** The login bonus included exclusive exchange tickets that players could exchange for a UR Demon Card of their choice from Nightmare Chapter A, along with other rewards
* A Charge Mission was available
* Special Sales sets were made available
* "Pajama Time" outfits for Wanderers' Whereabouts were released for all characters
** These outfits are exclusive to WW, and are worn by the characters around the house and during video calls
* "Spooky" Majolish Outfits were added for all characters
* The new song Spooky Night Parade was featured in Ruri★Tunes
* Messages from the characters were posted on the official Twitter account
** Lucifer's message, Mammon's message, Leviathan's message, Satan's message, Asmodeus's message, Beelzebub's message, Belphegor's message
** Diavolo's message, Barbatos's message, Luke's message, Simeon's message, Solomon's message
** Thirteen's message, Mephistopheles's message, Raphael's message
Category:Special Events (NB)