Shijima's Older Sister

しじまの姉

Shijima Tsukishima's older sister who acts as a parent figure. She is a university dropout who is currently working on her own research. Her goal is to learn the secrets of reality and understand everything in existence. [Spoiler] She unlocks the key to boundless imagination and accidentally uses it to create a clone of herself that desires to unlock this key for everyone, which she succeeds at. [/Spoiler]