Holding the obscene lingerie given to her by her husband, Keiko (Momoko Isshiki) feels confused by his request to try something different. While her husband is away on a business trip, she secretly puts on the undergarments in her room and examines her reflection in the mirror. For the first time in a long while, she recalls herself not as a wife, but simply as a woman. However, the man from the neighboring house accidentally sees her through the balcony. Embarrassed at being watched, she still finds herself stirred by the forbidden thrill of being noticed by a man other than her husband. Torn by these conflicting emotions, an unconscious desire begins to throb between her legs.