Ayumi Otosaka

A middle-school student and Yuu's younger sister. She likes stars. She is also a huge fan of the Idol Yusa Nishimori.

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.]