Mea, Itsuha, and Tatsuya have been inseparable since childhood and even work at the same company. Though both women are married, they have always had feelings for him. After drinks at home, the three drunkenly have a threesome, but none remembers it the next morning. To recover the missing memory, they decide to do it all over again. With every boundary erased, the childhood friends openly flirt and have creampie sex even at work, forming a far more intimate relationship than before.