After being divorced by his wife, a middle-aged man lives alone until his niece suddenly shows up, having run away from home. Quiet and shy around others, she secretly harbors bold and lewd fantasies. Though reserved in nature, she hides a lustful side, often peeking at her uncle in the bathroom, constantly drawn by sexual curiosity. One day, Miki catches herself masturbating in her room and, unable to resist her urges, seduces an older electrician who comes to fix the air conditioner, having sex with him using her shaved pussy. With her libido unleashed, Miki grows bolder and begins seducing her uncle. Their shared household becomes a complex, compelling mix of familial bonds and sexual tension.