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Ayumi Otosaka
A middle-school student and [Yuu](https://anilist.co/character/88950/Otosaka-Yuu)'s younger sister. She likes stars. She is also a huge fan of the Idol [Yusa Nishimori](https://anilist.co/character/88953/Kurobane-Yusa). She awakens the ability to make everything around her collapse, but ultimately, this awakening leads to her death. In episode 6, during a lunch break at school, Ayumi is threatened with a box cutter by a jealous classmate; she begins to run, but is soon cornered. Instinctively, she uses her ability, which collapses both the roof above her and the floor below; killing her. In episode 10, she is saved by her brother Yuu who traveled back in time using their brother [Shunsuke](https://anilist.co/character/125388/Otosaka-Shunsuke)'s ability of time leap. Her ability was plundered by Yuu after he had time leaped backwards, so she no longer has the ability.
