Two married female colleagues, Kana Imai and Serina Usui, with diametrically opposed sexual orientations (and personalities), take turns having extramarital affairs. HEZ-860

[Kana, the general manager and boss's wife, a serious, quiet, and reserved woman] × [Selina, the cheerful, lively, and competitive senior employee's wife] × [Competing for his sexual organs] Serina is an amateur woman, and there's always an undercurrent of competition between her and Tate, an elite employee about to graduate from university. Her capable boss, Kana, always gently mediates their conflicts. At a celebration party, Serina and Tate have an affair. As the two compete for Tate, their rivalry intensifies, eventually escalating into a chaotic extramarital affair.