The days of a couple devoted to their son. Ayano, the wife, goes to peek into her son's room as usual, only to find adult toys neatly laid out. Her son has never used them on a woman—instead, he's been practicing with them to perfect real intercourse. Learning this truth, Ayano resolves to express her deep affection by satisfying him herself, using her own body. Her genuine love begins to transform her son's heart...