Nono and Momoka, young Japanese sisters, find themselves alone and horny. They decide to masturbate together, their bodies yearning for touch. Nono slips her hand into her panties, rubbing her clit as Momoka watches, her own hand sneaking up her skirt. They moan softly, their eyes locked, when suddenly their mother walks in, catching them in the act. Embarrassed, they stumble over explanations, but the tension remains, their desire for each other undeniable.