The main characters' knockout teacher, Mitsuka is both intelligent and resourceful. She is also a shameless exhibitionist who spends more time conniving to "show off" to her students than she does teaching them English. Mitsuka has a habit of popping up when it is least convenient to Takeya and company, turning normal conversations into overly embarrassing situations,usually by mistaking most things for sexual acts and orgys. At times though, she does show surprising insight concerning the relationships of others, especially between Ren and Takeya.