A beautiful female teacher invites students she likes to her home under the pretense of "extra lessons." Invited by her popular girlfriend, the students step through the door with high hopes. However, at night, when her husband is asleep, she smiles seductively and reveals her true nature. In the basement, behind the peaceful daily life, where the students reach their limits and are treated as sex toys until she is satisfied, there is a secret time that no one knows about.