One afternoon, 18-year-old Satomi can no longer endure the throbbing ache between her legs and secretly heads to her cousin's uncle, hiding it from her family. She has already undergone sexual training by her uncle and now shamelessly exposes herself as his obedient, depraved "pet dog." Today, once again, Satomi chooses to obediently accept various humiliating disciplines from her uncle, craving his affection. Her actions reflect the inner desires she hides deep inside, as well as her inner conflict over keeping this secret from her family.