Miki’s office affair leaves her wracked with guilt—only her friend Buuyan truly understands. Buuyan, secretly pining for their charismatic judo sensei, finds herself drawn into an unexpected bond when she stumbles on Kazumi and his young son attempting a petty heist during her night patrol. Instead of calling security, Buuyan’s compassion sparks a series of clandestine, tension‑filled encounters that blur the lines between duty, desire, and fierce protectiveness—each grapple on the tatami igniting raw, forbidden longing filled with lust and sex.