Caregiver "Mitsuki" was in charge of "Hamura", who now resembles his late grandfather. Hamura gradually harbors wicked feelings towards the gentle Mitsuki. And on the day Hamura celebrates her 80th birthday, Hamura explodes her libido against Mitsuki who entertains her with meal assistance and massage! Mitsuki reluctantly performs sexual treatment in front of a pitiful old man who does not know her body.
