Mayu Mihara

Mayu had a troubled past. She used to be a delinquent who looked down upon her family, but after she was kidnapped in middle school by her college boyfriend and subjected to drug abuse she becomes psychologically unstable. She becomes overly attached to her brother because he was the only person willing to stay by her side during her turmoil.

She is seen later as a side character in Kimi wo Taosu to Kokoro ni Kimeta!! having made a fully recovery and become healthy once again, though still affectionate for her brother.