Hikaru takes on the role of caring for her childhood friend Ryota's parents, who ask her to look after their elderly grandfather, Kozo. Having lost his wife, Kozo has lost the will to live, but he smiles in front of the angelic Hikaru. Worried about Kozo's health, Hikaru provides him with the kind of loving care he would give to a family member. Ryota, who secretly has feelings for Hikaru, becomes jealous of their relationship and plots to destroy it. However, this ends up leading them deeper into a lewd, forbidden world... #BanchoP