Tamaki begins training at an elementary school to earn his teaching liscence, and meets a delinquent teacher. His hair is messy, always wearing sweat pants, and a dull look. First impressions of Ei Hideo were terrible, but… Tamaki’s teaching instructor and Hideo’s older sister Rikako insists Tamaki to live with them!! Under the same roof with a senior teacher… A secret lesson in love ♪