A married woman, Yukie, moves in next door to a young man, Kyo. Although she is a little plain, she is elegant and has an amazing figure, and Kyo has a crush on her. Kyo is tormented by Yukie's moans in the daytime, and lives in agony, listening to them through the wall. One day, a delivery man mistakenly delivers Kyo's "masturbation aid" that he ordered online at the request of a friend and Yukie's "see-through underwear" that he ordered online as a hobby to the wrong place... Kyo finds out that Yukie's hobby is collecting see-through underwear...