Nakasu, Mariko

She goes by the nickname “Body Ko” due to her typically sultry look. While she has a reputation for sleeping around, she admits to being weary of dating men who are only interested in her for sex. Her true love is a childhood friend from Yokohama. After a brief relationship with Tsutomu ends, she begins pursuing Yuusuke and starts dating him, somewhat competing with Ayumi for his affection.