"Senpai, I'll dominate you to the marrow of your bones." Sumio Tachibana, a resident orthopedic surgeon, has spent his days as a sub controlling his desires to be dominated and controlled. However, he doesn't have a designated Dom, and remaining in this state will damage him both mentally and physically. Because of this, Sumio decides to visit a SUB-only club... There he meets his old high school junior, now a yakuza, Wanizuka Itsumi. Since Sumio doesn't have a designated dom he urges, "Let me become senpai's dom." ?! (Source: Renta!, translated) Note:The chapter count includes two extra chapters.