ぜんぶ君のせいだ。

Zenbu Kimi no Sei da. (ぜんぶ君のせいだ。) is a "yami-kawaii" idol group formed in 2015. Yami kawaii is a style that combines themes of sickness and cuteness. They released their first digital single "Neo Jealous✡Mero Chaos" on July 8th, 2015.

They released their second digital single "Shit End Placebo" on August 12th, 2015. New member Hitomi Yotsu joined the group shortly after the release.

On October 17th, 2015, Yumesaki Asuna withdrew from the group.

In November 2016, Mogeki Aza and Narumi Gomochi were suspended from the group for hanging out with fans, which is a serious breach of contract. Aza withdrew from the group immediately and Gomochi withdrew after the group's year-end one-man live on the 30th of December.

On the 28th of December a new member, Togaren, joined the group, and an another new member, Mikuchiyo Mene, joined on January 14th, 2017.

The new members debuted on Zenbu Kimi no Sei da's 3rd single "Sophomore Sick Sacrifice", released on February 15th, 2017.

On August 5th, 2017, Mikuchiyo Mene withdrew from the group due to health issues.

On April 28th, 2019, Togaren withdrew from the group and retired from the entertainment industry.

On May 6th, 2019, two new members, Yukinojou Oyatsu and Nagi Akebono, were revealed.

On August 10th 2020, two members, Nagi Akebono and Hitomi Yotsu, graduated from the group.

On September 30th 2020, one of the original members, Mashiro withdrew from the group. 3 members were added on the same day.

On January 11th 2021, two former members of Yukueshirezutsurezure (ゆくえしれずつれづれ), Mei Yui Mei and Kotetsu, were revealed as sixth and seventh members of the group.

On April 3rd 2022, two members, Yukinojou Oyatsu and Amanechi An, withdrew from the group. Nene Komochi, originally from Seireki13ya (星歴13夜), was added as new member to the group.

Current Members: Kisaragi Megumi (如月愛海) Shizuku Fufu (雫ふふ) (Joined on September 30, 2020) Motochika Kasane (もとちか襲) (Joined on September 30, 2020) Mei Yui Mei (メイユイメイ) (Joined on January 11, 2021) Kotetsu (个喆) (Joined on January 11, 2021) Nene Komochi (寝こもち) (Joined on April 3, 2022)

Former Members: Yumesaki Asuna (夢咲夢日) Mogeki Aza (もげきあざ) Narumi Gomochi (成海5才) Mikuchiyo Mene (未来千代めね) Togaren (咎憐无) Hitomi Yotsu (一十三四) Nagi Akebono (凪あけぼの) Mashiro (ましろ) Yukinojou Oyatsu (征之丞十五時) Amanechi An (甘福氐喑)