After his father's death, Kumi's life takes a drastic turn from high school student to aspiring adult film star under the guidance of Sakuma, a seasoned trainer in the industry. Despite learning the ropes of the trade, Kumi struggles to differentiate between love and physical intimacy. Fast forward to the present, Kumi and Sakuma share a cohabited life, professional ventures, and an occasionally platonic bond, all while running their own adult video company, Lucky Hole. Amidst their complex dynamics and ambiguous emotions, as they engage in separate relationships, their intertwined fates blur the lines of their connection. Shinjuku Lucky Hole unravels a narrative of adult relationships, stretching across years of passion, heartache, and unfulfilled desires.