Nishida mistakenly receives a package addressed to his neighbor's wife, Yuka, and ends up getting caught up in a sexy lingerie unveiling party. While he wonders how this happened, Nishida is also curious to see Yuka getting changed. He makes up his mind and peeks into the bedroom, where he finds Yuka struggling with her front-hook bra. He can't take his eyes off her beautiful breasts, which bounce out every time the hook comes undone. Then, Yuka notices Nishida's passionate gaze and asks him to help her get changed...