|Relatives|| Yu Otosaka (Older Brother) |
Shunsuke Otosaka (Older Brother)
|Anime||Charlotte Episode #1|
Ayumi Otosaka is Yu Otosaka's little sister.
Ayumi and her older brothers were lab patients due to having powers. As she was being on the verge of being dissected, Yu frees Shunsuke who uses his time traveling abilities to change the future.