Hajime, the only son of a wealthy family, was raised in an overprotective environment. His mother, Nozomi, worried about her son's sometimes unreliable nature, but one day he announced he was bringing a girlfriend home. "Since he chose her, she must be a kind girl," she thought, welcoming her warmly. However, the girl who arrived, Yukine, was beyond her wildest imagination. Her appearance and behavior couldn't be simply dismissed as typical of today's young people... and then, "Auntie,..."