Riho's husband has an unspoken sexual fetish. It's an infidelity fantasy: he longs to see his wife, whom he loves deeply, having sex with other people. However, he can't accept her cheating on him with a man, so he asks his lesbian friend from college, Waka, to have sex his wife. At first, Riho hesitates, but little by little she gives in to the pleasure, revealing an orgasm her husband has never seen before. Her husband is intensely aroused by this scene. However, something seemed off about his wife afterward. Riho tries to meet Waka even when his husband isn't around. Over time, Riho begins to ignore her husband, and her relationship with Waka becomes something unusual…