Six years ago, his wife left home. Since then, Abe has been raising his son, Wataru, all on his own—but now the boy is a third-year ronin student, failing repeatedly. Desperate for Wataru to pass his exams next year, Abe asks his coworker Honjo for help. Honjo sends someone completely unexpected: a stunning, big-titted married woman, oozing sex appeal, ready to bring excitement into this all-male household. Her arrival turns the Abe family's daily life upside down.