Oshii

A classmate of Alice who bullies her, she has a crush on Kyô. She almost blackmails Kyô to be her boyfriend by threatening tell his "dark secret;" however, Kyô refuses. Ôshii then tells the entire school that Kyô once tried to kill a classmate from another. It is revealed Ôshii suffers from a Maram monster in her that has been in her heart for a very long time. When Alice defeats the Maram monster, Ôshii becomes a much nicer person who even begins to support Alice. *Wikipedia