Character profile
Ayumi Otosaka
乙坂歩未Ayu / Ayucchi
Biography
Ayumi Otosaka is Yuu's younger sister, a middle-school student who loves stars and is a devoted fan of idol Yusa Nishimori.
Story spoilers
Ayumi awakens an ability that causes her surroundings to collapse, and its activation leads to her death. Yuu later travels back in time using Shunsuke's time-leap ability, saves her and takes her collapse ability, leaving her without it.
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