Happy Devil Day

Happy Devil Day — sometimes shortened to "HDD" — is an anniversary celebration that takes place in the month of December, with a number of events, rewards, and updates happening in commemoration of the original release date of Obey Me!, December 12. There are also "Happy Devil Day .5" events during the month of June 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.
== Happy Devil Day 2024 ==
* Special Sweet Love of Mine! and A RADical Celebration! Nightmares were released
** The cards in Sweet Love of Mine! do not have Devilgrams or chats
* Tracing Christmas Memories 1 and Tracing Christmas Memories 2 Nightmares were released
** Both Nightmares featured a free x10 summon once per day for 10 days, for a total of 200 free summons
* A Revival of the Demons Nightmare was released
** The Nightmare featured Skill Animation and Moving Picture UR+ cards from past events for all characters
* Pop Quiz Presenting Perfect Memories was released
** The Pop Quiz has four chapters
* Two Luke's Pint-Sized Challenges were released, and when the player completed the missions, they could obtain two Memory UR Cards with art from the Mixx Garden Black Cat Butler Cafe Collab of 2023, however neither card comes with a Devilgram story
** Happy Devil Day 2024 Pint-Sized Challenge Vol. 1
** Happy Devil Day 2024 Pint-Sized Challenge Vol. 2
* Thanks for the Memories 1 and Thanks for the Memories 2 Login Bonuses were released
** Feline Butler Home Pictures were part of the reward set for the first login
** Home Pictures featuring artwork from a pop-up shop at Kinokuniya Bookstore in 2021 and Lucifer UR Card were part of the reward set for the second login
*** Lucifer's UR Card does not come with a Devilgram story or chats
* Happy Devil Day (2024) Login Bonus was released
* A Special Sale set was released
* Players received gifts in their mailbox for clearing certain milestones in Tasks
** This task does not have a time limit to complete
** Clearing Lesson 20-20 Normal awards 100,000 Grimm, 1 Demon Voucher, 100 AP, and 1 Lonely Devil Ticket
** Clearing Lesson 40-23 Normal awards 120,000 Grimm, 2 Demon Vouchers, 150 AP, and 2 Lonely Devil Tickets
** Clearing Lesson 60-23 Normal awards 150,000 Grimm, 3 Demon Vouchers, 200 AP, and 3 Lonely Devil Tickets
** Clearing Lesson 80-23 Normal awards 180,000 Grimm, 4 Demon Vouchers, 250 AP, and 4 Lonely Devil Tickets
* Dark Santa outfits were available for Mammon, Leviathan, Belphegor, Diavolo, Barbatos, and Simeon
* 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 ==
* A thank you card was posted on the official Twitter account
* The Obey Me! Audio Drama Soundtrack was released to streaming in three volumes
== Happy Devil Day 2023 ==
* Special Nightmares Merry Devildom Xmas 1 and Merry Devildom Xmas 2 were available
* The Celestial Blessing Pop Quiz Happy ☆ Holidays! was available
** The Pop Quiz has four chapters total
* A special Login Bonus was available
* All characters received Noel outfits
* The new song Magic Moment was released
* 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 .5 2023 ==
* A special Login Bonus was available
** The login rewards were Home Pictures of the brothers
== Happy Devil Day 2022 ==
* Nightmare Revival of the Demons: Almost Three! was released
* Event Nightmares The Three Worlds Pre-Party Vol. 1 and The Three Worlds Pre-Party Vol. 2 were released
** Both Nightmares featured a free x10 summon once per day for 10 days, for a total of 200 free summons
** On a player's 10th, 15th, 20th, 25th, and 30th Summon x10, they would receive a guaranteed UR+ card
* Event Nightmares Our Intertwined Destinies 1 and Our Intertwined Destinies 2 were re-released
* The Celestial Blessing Pop Quiz The Three Worlds Festival was released
** There were two boosting periods for this quiz
* A special Login Bonus was available
* A Charge Mission was available
* Two Pint-Sized Challenge missions — Vol. 1 and Vol. 2 — were released
** Memory card rewards from each challenge included a Devilgram story
* Special Sales sets were made available
* Another Happy Year card was gifted as a reward from the retweet campaign
* Video messages from the voice actors of the demon brothers and the side characters were released on YouTube
* Video messages from Lucifer, Mammon, Leviathan, Satan, Asmodeus, Beelzebub, Belphegor, Diavolo, Barbatos, Luke, Simeon, Solomon, Mephistopheles, Raphael, and Thirteen were released on YouTube
== Happy Devil Day .5 2022 ==
* Event Nightmares Almost Three! Karasu's Blessing! and Conquering the Devildom released
** Almost Three! Karasu's Blessing! featured a free x10 summon once per day for 5 days, for a total of 50 free summons
* Revival of the Demon Nightmares for Mammon, Leviathan, Satan, and Asmodeus released
* The Celestial Blessing Pop Quiz The Great Yokai Parade was released
** There was a special x3 Boosting Period for this quiz
* Players could summon 50 times for free in the Chapter A Nightmare
* A special Login Bonus was available
* A Charge Mission was available
* A Pint-Sized Challenge was available
* Special Sales sets were made available
== Happy Devil Day 2021 ==
* Event Nightmares Our Intertwined Destinies 1 and Our Intertwined Destinies 2 released
** Both Nightmares featured a free x10 summon once per day for 10 days, for a total of 200 free summons
** The Devilgrams from the cards are fully voiced
* Event Nightmares Jingle Demons and Winter Wonderland were also re-released
* The Celestial Blessing Pop Quiz A Surprise for You was released
** This quiz's story and associated Devilgrams are fully voiced
** This was the release of the first Celestial Blessing Pop Quiz
* Mephistopheles, Raphael, and Thirteen were announced as new characters
** Memory Cards including each of these characters were also added to the Chapter M Nightmare
* UR Card summoning odds in the Chapter M Nightmare permanently increased from 1% to 3%
* Lessons 60-80 began releasing
* A special Login Bonus and additional Event Login Bonus were available
* A Charge Mission was available
* Special Sales sets were made available
* Video messages from the voice actors of the demon brothers and the side characters were released on YouTube
== Happy Devil Day .5 2021 ==
* Event Nightmare Bedtime Lullaby released
** The Devilgrams from the cards are fully voiced
* The Pop Quiz Toys Galore released
* Players could summon 50 times for free in the Chapter M Nightmare
* A special Login Bonus was available
* A Charge Mission was available
* A Pint-Sized Challenge was available
* Special Sales sets were made available
== Happy Devil Day 2020 ==
* Event Nightmares Jingle Demons and Winter Wonderland released
* The Pop Quizzes Angelic Demons and The Final Countdown released
* Diavolo, Barbatos, Luke, Simeon, and Solomon were added to the game's Intimacy system
** Demon Cards for each of these characters were also added to the Chapter A Nightmare
* UR Card summoning odds in the Chapter A Nightmare permanently increased from 1% to 3%
* Asmodeus's UR+ card Snowy Bliss was gifted in the Mail to all players
* Lessons 41-60 began releasing
* A special Login Bonus was available
* A Charge Mission was available
* Special Sales sets were made available
* Both a music video and anniversary messages video were released on YouTube
== 6 Months Release 2020 ==
* Event Nightmare A Party for You (Prelude) released
* The Pop Quiz A Party for You (Septet) released
** Card rewards for this quiz had Abilities for the first time
* Lessons 20-40 began releasing
* A special Login Bonus was available
* A Charge Mission was available
* Memory Cards of Diavolo, Barbatos, Luke, Simeon, and Solomon were released
** Cards were obtainable by collecting card pieces in Lessons
* Daggers were released to allow players to Unlock a Card's Maximum Level Cap
Category:Special Events