In a cramped Japanese apartment, sisters Nono and Momoka, both amateurs, discover the pleasure of self-love together. Nono tentatively touches her clit, her eyes closed in concentration, her moans soft but insistent. Momoka watches, her breath hitching as she becomes aroused. She joins in, their fingers moving faster, their bodies shaking as they approach orgasm. The room fills with the sound of their wetness and moans, their orgasms intense and simultaneous.