In 20xx, the "polyandry system" was approved and adopted in Japan. The main provisions are: one wife may have up to two husbands. However, sexual intercourse must be with only one husband as a rule. Kaoru is in love with his wife, Julia, but her other husband, Toru, is in charge of sex. Immediately after Kaoru and Julia talk about their love for each other, a sexual act unfolds right in front of Kaoru's eyes. The extremely twisted life of two husbands and one wife soon begins to go awry...