During a long hospital stay, an AV actor recovering from injury finds his cock always hard despite the pain. Whenever his physical therapy session begins and his therapist touches his chest, he instantly gets erect, unable to control himself. That's when he meets Minagishi, a popular, mature-looking beauty. When she pulls out his cock and pretends to sleep while touching him, he can't hold back any longer. Left alone in the therapy room, even when he begs her to keep it secret, she naturally starts kissing him. Their sex using rehabilitation equipment becomes intensely erotic, sending waves of unstoppable pleasure. Meanwhile, another physical therapist assigned to him, Nitta, keeps bringing up his erection. Suspecting her interest, he takes the initiative and forcefully approaches her—only to find her happily giving in. They end up having creampie sex in his hospital room, deepening their secret relationship.