A stepmother's warmth slowly melts her daughter's heart. Tomoko lives with Aya, her stepdaughter, navigating daily tensions and emotional distance. What begins to bind them together is an old relic from the past—an infantile diaper. One morning, a large wet stain spreads across the sheets. For Aya, Tomoko brings out a thick cloth diaper. "From now on, I'll be your mommy and put this on you," she says, offering the first genuine warmth Aya has ever felt from her. Overcome by the soft, plush sensation, Aya wets the diaper heavily. "Put on my diaper... I want to drink milk," she pleads, craving even more affection—eventually asking to be breastfed. "Say 'please put on my diaper, Mommy,'" Tomoko coaxes. Watching this, Tomoko herself slowly grows envious of her daughter's release, and soon the two begin sharing diapers and wetting together. As Aya's once-closed heart gradually opens, Tomoko introduces enemas, deepening their twisted intimacy. A spiritual sequel depicting the aftermath of the classic "Mother's Enema," focusing on Tomoko, the protagonist's best friend. A sweet, yet eerie tale of diaper love that weaves an unbreakable bond between stepmother and daughter.