Tired after a day's work, Nagi decides to take a nap even though Sakuya's birthday party is that same evening. At the party, Aika Kasumi discovers that Chiharu works as Sakuya's maid. Meanwhile, Sakuya forces an extremely reluctant Wataru to entertain her and her guests; he performed tamely yet Sakuya comforts him and he trips on top of her in time for Isumi to see them...