Mitsuki, a caregiver, was in charge of Hamura, who resembled her late grandfather. Hamura gradually began to have evil feelings towards the kind Mitsuki... And on the day of Hamura's 80th birthday, Mitsuki treated him to meals and massages, but Hamura's sexual desires explode! Mitsuki has no choice but to satisfy the poor old man who has no knowledge of the female body...