Curled up in pain, a young Japanese college student reaches out to her step uncle for a simple tummy massage. Her innocent request, however, sparks an unexpected chain of events. As the uncle's strong hands work on her abdomen, the young woman's discomfort transforms into a warm, tingling sensation, awakening a new kind of ache. Her step uncle, initially confused, begins to notice the subtle changes in her body, the soft moans escaping her lips. The line between concern and desire blurs as they find themselves in uncharted territory.