Rougebook

 (ルージュブック) is an idol group set to debut on March 15, 2023. Their concept is "Little Red Riding Hood".

In September 2022, an audition was announced to find members for the group in addition to Tsukimori Koko and Haruno Ririka, who had already been chosen. Auditions concluded in late December and the full line-up was announced on January 22, 2023.

Members

 * Tsukimori Coco (月森湖子)
 * Haruno Ririka (春乃梨々花)
 * Kawabata Ayari (川畑綾理)
 * Shirahana Sui (白花翠)
 * Kanai Yuuna (金井柚那)
 * Sena Haruka (瀬奈晴香)
 * Sakuragi Miyuu (櫻木美有)
 * Hirai Sana (平井紗凪)