On a leisurely holiday afternoon, single mother Miori Akimoto visits the home of her former subordinate, Saki, who is now married. Miori sets her sights on Saki's husband, Yoshifumi, and manipulates the situation by revealing Saki's infidelity to him, then seducing him herself. The two end up having sex, leading to a tangled web of complex relationships and emotional conflict. A story of betrayal, desire, and forbidden passion.