After a casual remark from his junior about adult entertainment venues, the hedonistic Saeki playfully experiments with a misplaced battery in an unexpected way. Panicked by the mishap, he seeks help from gastroenterologist Kirishima-sensei, who provides an unconventional hands-on demonstration of prostate location. This sparks a titillating journey of desire between the composed doctor and the pleasure-seeking patient, blurring the lines between medical treatment and newfound passion.