Shuuhei and Yakumo used to live together trapped in the "sir" house, where they were taught to have immoral behaviors as a "couple". When the "Lord" is arrested, these two don't see each other again until after 12 years when they meet by coincidence. Without being able to leave Yakumo, who seems to be being pressured to have sex by his real brother, Shuuhei decides to take him home. An immoral love of attachment and dependence begins.