Nanami and Airi were my childhood friends, and I had feelings for both. But being indecisive, I couldn't choose either, and before I knew it, we had all grown up. Then suddenly, polygamy was introduced as a measure against declining birth rates, and the three of us entered into a marital relationship. The two, who had always been close, began competing for my affection, sparking an intense marital rivalry. I ended up receiving blowjobs in secret from Airi, sneaking into mixed baths with Nanami while lying to her, and repeatedly fulfilling our conjugal duties amid this tangled three-way relationship. With this new polygamous system, will the day finally come when my harem becomes a reality?