Mimosa Yakata de Tsukamaete

When Haruko Sonobe, a new teacher at an all boys High School, is looking for cheap housing she sees a flyer outside an old mansion with a room for rent. The owner is young man who offers her a low-rent on one condition: helping to prepare dinner every evening. Haruko accepts, but is astonished when she finds out the next day that Arei, the young man, is a student of her class.