The Yamamoto couple enjoy a happy and harmonious marriage, appearing like any ordinary, unremarkable couple at first glance. But their private life is anything but average. Wife Miwa receives her husband's love through intense, dominating sexual acts, believing she would do anything for him. One day, her husband makes a sudden proposal: "I want to test whether your love for me is real. Can you promise me that you won't orgasm, no matter what, even if you have sex with another man?"