Kanojo ga sono na wo shiranai toritachi

Tawako's boyfriend is not her kind, but she puts up with it in exchange for shelter. Her old boyfriend of almost a decade ago is long gone, and was also not nice, but like most girls she still reminisces about him and is attracted to his bad ways. Enter Mizushima who reminds Tawako of her old boyfriend, but soon more transpires to remind the girl of her old relationship.