妻の尻に敷かれレスに悩む会社員・正人は、気晴らしに訪れた箱ヘルで、憧れのママ友・ひまりと遭遇する。互いの秘密を共有し「共犯関係」となった二人は、店でのプレイに留まらず、互いの自宅を行き来し禁断の不倫行為に溺れていく。清楚なひまりの淫らな奉仕に魅了された正人は、借金をしてまで店に通いつめるほど彼女への愛欲を募らせていく。

Masato, a company employee henpecked by his wife and suffering from a lack of intimacy, visits a brothel to unwind and unexpectedly encounters Himari, a fellow mother he's always admired. Sharing each other's secrets and becoming accomplices, the two go beyond just playing at the brothel, visiting each other's homes and becoming engrossed in a forbidden affair. Enchanted by Himari's lewd service despite her innocent appearance, Masato's desire for her grows so strong that he goes into debt to frequent the brothel.