Her name is Ryoba aishi, she is a cheerful and friendly young woman who seems to get along very well with everyone in her neighborhood, she has long black hair and dark brown eyes, although nobody seems to know why she had a extremely heavy music box for 10 weeks... and her crush went missing the day after she went on trial... hmm...well, she's a yandere and she is trying to eliminate...cof cof, kill, the 10 girls that are trying to "steal" her senpai.