The quiet of night shattered by a throbbing desire in the lower abdomen. One night, after calling a delivery health service, an unexpected visitor arrives—his stepmother. The shocking truth? She pleads with him not to tell his father, confessing, "I used to be a sex worker." Their relationship continues as it is. What if he had chosen a different path? Also included are taboo relationships such as sister x brother, aunt x nephew, and other socially forbidden incestuous affairs. The tenth volume of the Monthly Incest Omnibus Collection is a profound work that challenges the boundaries between desire and morality.