Io is an office worker enjoying her dream job. One day, she gets an unexpected visit from her childhood friend, Hiro Nikaido. To her surprise, Hiro's father is the CEO who owns the parent company of the office she works for. Hiro stayed faithful to a promise the two of them made as children, and immediately asks Io to marry him! He doesn't just make her move in with him so she doesn't attract unwanted attention from other men, either. Once she's in bed naked, he forbids her from losing weight, claiming he'll love her body from head to toe... and she'll carry the result of his affection in her womb. Does this mean Hiro's a chubby chaser!? At this rate, Io's going to climax from baby-making love...!!