Project SEKAI×Aku no Taizai Series

Project SEKAI×Aku no Taizai Series was a collaboration between Project SEKAI and mothy's Aku no Taizai Series (Nanatsu no Taizai Series, Seven Deadly Sins Series).
The collaboration featured VIRTUAL SINGERs as the characters depicted in the series.

Aku no Taizai Series

The Aku no Taizai Series is a multimedia series detailing the events caused by the vessels of sin, cursed relics inhabited by the Demons of Sin. This series is a part of mothy's larger Evillious Chronicles, a dark fantasy series that is told through songs, books, and manga. For more information, check out The Evillious Chronicles Wiki's articles on the Aku no Taizai Series and the Evillious Chronicles.

Login Campaign

Main article: Aku no Taizai Collaboration Login Campaign

Players who logged in between December 13, 2021 15:00 JST and December 27, 2021 14:59 JST received The Slothful, Sleepless Widow and brioche.

Login Campaign rerun

Players who logged in between May 3, 2023 15:00 JST and May 17, 2023 14:59 JST received The Slothful, Sleepless Widow and brioche.

Aku no Taizai Series SEKAI

Main article: Aku no Taizai Series SEKAI

The Aku no Taizai Series SEKAI is a time-limited Sekai, available only during this collaboration. The characters featured within this collaboration can be found there.

Gacha

Main article: Memoirs of Sins Gacha

This collaboration also came with Memoirs of Sins Gacha. The gacha started from December 13, 2021 and ended on December 27, 2021.

Gacha reprint

Main article: Memoirs of Sins Gacha - Reprint

The collaboration rerun also came with Memoirs of Sins Gacha - Reprint, a rerun of the original gacha. The gacha started from May 3, 2023 and ended on May 17, 2023.

Cards

The gacha featured five limited 4☆ cards, each featuring a Aku no Taizai Series character.

ID	Thumbnail	Card name	Character	Status	Skill
335		The Arrogant Princess	Kagamine Rin	Limited	Scorer
336		The Twin Servant	Kagamine Len	Limited	Scorer
337		A Tailor Driven Mad by Jealousy	Megurine Luka	Limited	Perfect locker
338		The Evil Food Eater	MEIKO	Limited	Healer
339		The Greedy Judge	KAITO	Limited	Perfect locker
340		The Slothful, Sleepless Widow	Hatsune Miku	Limited	Scorer

Costumes

Each of the five 4☆ cards came with limited costumes and hairstyles unique to their respective VIRTUAL SINGERs.

Thumbnail	Costume name	Gender	Release date	Acquisition method(s)	Accessory	Unique accessory	Unique hair
	Lucifenia Kingdom's Princess' Formal Dress	Ladies	2021-12-13	Card Costume Shop	No	Yes	Yes
	Lucifenia Kingdom's Servant Attire	Men	2021-12-13	Card Costume Shop	No	Yes	Yes
	Bloodstained Insanity Dress	Ladies	2021-12-13	Card Costume Shop	No	Yes	Yes
	The Female Duke's Bewitching Dress	Ladies	2021-12-13	Card Costume Shop	No	Yes	Yes
	USE Dark Star Bureau's Judge Attire	Men	2021-12-13	Card Costume Shop	No	No	Yes

Songs

Seven songs were added during the collaboration, three during the first run and four more during the rerun.

ID		Name	Singer	Producer	Date added
190		Aku no Musume (悪ノ娘, The Daughter of Evil)	Kagamine Rin	mothy	2021/12/13
191		Aku no Meshitsukai (悪ノ召使, The Servant of Evil)	Kagamine Len	mothy	2021/12/14
192		Saribitotachi no Waltz (去り人達のワルツ, Waltz of the Deceased)	Kagamine Rin	mothy	2021/12/15
349		Akujiki Musume Conchita (悪食娘コンチータ, Evil Food Eater Conchita)	MEIKO	mothy	2023/05/03
350		Nemurase Hime kara no Okurimono (眠らせ姫からの贈り物, Gift from the Princess who Brought Sleep)	Hatsune Miku	mothy	2023/05/04
347		Enbizaka no Shitateya (円尾坂の仕立屋, The Tailor of Enbizaka)	Megurine Luka	mothy	2023/05/05
348		Akutoku no Judgement (悪徳のジャッジメント, Judgement of Corruption)	KAITO	mothy	2023/05/06

Featured characters

• 
  Hatsune Miku as Margarita Blankenheim.
• 
  Kagamine Rin as Riliane Lucifen d'Autriche.
• 
  Kagamine Len as Allen Avadonia.
• 
  Megurine Luka as Kayo Sudou.
• 
  MEIKO as Banica Conchita.
• 
  KAITO as Gallerian Marlon.

• 
  Hatsune Miku as Margarita Blankenheim.
• 
  Kagamine Rin as Riliane Lucifen d'Autriche.
• 
  Kagamine Len as Allen Avadonia.
• 
  Megurine Luka as Kayo Sudou.
• 
  MEIKO as Banica Conchita.
• 
  KAITO as Gallerian Marlon.

Timeline of events

September 26, 2021

• Collaboration announced on Project SEKAI Wondershow Channel Anniversary Festa 2021.

November 22, 2021

• Collaboration details announced on Project SEKAI Wondershow Channel #14.

December 13, 2021

• Collaboration began.
• Aku no Taizai Collaboration Login Campaign began.
• Memoirs of Sins Gacha began.
• Aku no Taizai Series SEKAI can be visited.
• Aku no Musume added to the game.

December 14, 2021

• Aku no Meshitsukai added to the game.

December 15, 2021

• Saribitotachi no Waltz added to the game.

December 27, 2021

• Collaboration ended.
• Aku no Taizai Collaboration Login Campaign ended.
• Memoirs of Sins Gacha ended.
• Aku no Taizai Series SEKAI can no longer be visited.

May 3, 2023

• Collaboration rerun began.
• Aku no Taizai Collaboration rerun Login Campaign began.
• Memoirs of Sins Gacha - Reprint began.
• Aku no Taizai Series SEKAI can be visited once again.
• Akujiki Musume Conchita added to the game.

May 4, 2023

• Nemurase Hime kara no Okurimono added to the game.

May 5, 2023

• Enbizaka no Shitateya added to the game.

May 6, 2023

• Akutoku no Judgement added to the game.

May 17, 2023

• Collaboration rerun ended.
• Aku no Taizai Collaboration rerun Login Campaign ended.
• Memoirs of Sins Gacha - Reprint ended.
• Aku no Taizai Series SEKAI can no longer be visited.