Maki and Mizuki, two married women living on the same floor of an apartment building, often complained about their sexless marriages. One day, a young man named Yamada moved to the city and quickly captured both of their hearts. He helped Maki with her luggage, and that night she ended up staying at Yamada's place. A few days later, Mizuki came over to share dinner. As the married women's sexual frustrations grew, a new relationship developed between the three. This reverse threesome marks only the beginning of a dreamlike harem life.