Chisato, a married landlady who manages a mansion inherited from her family home, has lived a quiet life. When long-term tenant Miyamura suddenly announces he's moving back to his parents' house, he passionately confesses, "I've loved you all along!" and pins her down in a sudden embrace. Overwhelmed by his intense feelings, Chisato agrees to sleep with him—just this once. But Miyamura's fiery, relentless lovemaking stirs something deep within her, drawing her into a growing obsession. Unbeknownst to them, their secret tryst is witnessed by a neighboring tenant, sparking unexpected complications and escalating desires.