From DMP:
Haruka Iijima and his teacher, Nakagami Sensei, are in the middle of a bitter-sweet relationship. Being a student and teacher couple isn't easy, but they're about to find out that's the least of their troubles. Nakagami Sensei's family, the gang of impossibly beautiful, age-defying Nakagami Sensei obsessed individuals might just turn out to be the worst nightmare. Will this love be able to survive the perverted mystery that is the Nakagami Clan?!