After inheriting her late parents' apartment building, Yuka becomes the housemother of an adult student dorm. Its eccentric residents cause one problem after another, but their youthful charm brightens her hectic days. When one shy adult student shuts himself away after a painful breakup, Yuka's maternal instincts take over. Telling him to keep it secret from everyone else, she gently presses her lips to his and begins teaching him about adulthood in this adult campus role-play.