Ayumi Otosaka

Ayumi Otosaka is the younger sister of Yu Otosaka in Charlotte. She is a cheerful middle-school student who looks after the household and strongly supports her brother.

Ayumi Otosaka as Yu's emotional anchor

Optimistic, affectionate, and enthusiastic about cooking, Ayumi often lightens the story's tension. Her trust in Yu makes the consequences of his secrecy especially painful.

Collapse and the timeline-changing tragedy

Ayumi develops the ability Collapse, which can destroy the area around her when triggered by emotional distress. Her apparent death causes Yu to fall into despair, while time travel later allows him to change the event and save her, making her fate a major turning point.