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Untrusted summary:

A girl name Lia or now goes by Zero, Killed her parents and her younger brother died. She is left with no friends for years. She is lonely and depressed for some time but later on she finds out her brother was killed not by accident but on purpose. Only to make her even more depressed but to make her strive to kill the person who killed her brother. Untill she finally enrolls in a school only to meet...