Minami Reiko

She was a middle school teacher and the object of Sakaguchi's affection. She used to teach at a local middle school where Sakaguchi has been studying (which suggest that he was been there as a repeat student for quite a long time). She later on moved back to Tokyo after Sakaguchi in a fit of drunken stupidity forcefully drag her into one of his misdemeanors that eventually got him arrested. It also inadvertently jeopardize her reputation as a teacher in the town's middle school. Despite it, she forgave him and doesn't file any charges against him. She still sees hope in him in spite of his rowdy behavior.