Collapse is an ability that allows the user to crumble and destroy their surroundings or objects around them. It is used throughout the anime in Happiness You Did Not Notice (By Ayumi Otosaka) as she suddenly activates the power and in Charlotte and Memories to Come (By Yu Otosaka)

The person who is originally known to have this ability or first to obtain it is Ayumi Otosaka, whom is Yu Otosaka and Shunsuke Otosaka's younger sister. Later on, the ability is plundered by Yu Otosaka in order to protect her from its dangers and to have her life saved.

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