403ERROR

 (放課後403ERROR) is a self-produced rock idol group formed in 2017 and debuted on October 2017.

Current Members

 * Sakashita Sunao (坂下素直) (Original Member)
 * Hourai Fuuka (鳳来楓花) (Original Member)
 * Tadano Akari (只野あかり) (Joined April 7, 2018)
 * Sato Ema (佐藤えま) (Joined May 1, 2018)
 * Koedaponnu (こえだぽんぬ) (Joined June 15, 2018)
 * Nekota Ren (猫田れん) (Joined November 23, 2018)

Former Members

 * Fujishiro Tamaki (藤白珠綺) (Original Member)
 * Sakuraba Anzu (櫻庭杏) (Joined April 7, 2018, Graduated April 22, 2018)
 * Yakumo Misa (八雲みさ) (Graduated December 9, 2018)
 * Shibasaki Suzume (柴崎すずめ) (Joined January 20, 2019)
 * Usami Yume (宇佐美ゆめ) (Graduated September 13, 2019)
 * Katase Mio (片瀬澪) (Graduated March 10, 2020)
 * Sahara Ryoka (咲原涼華) (Original Member, Withdrew February 1, 2021)