A monkey and Aya trapped in an underground warehouse in a gymnasium where someone burned briquettes. The monkey unlocks her handcuffs with a wire that has fallen in one corner of her, even though she is stunned. Open the door closed with 10 padlocks from the outside and escape with Aya. From this situation, the monkey is inferred to be the crime of an internal human who is familiar with the school. After this, the monkey asks the members of the basketball club to tell him why the bright Aya became dark. Aya is said to have become a dark child because she was obsessed with the man she was dating. After this, the monkey who noticed the method that the criminal made the master key changes the lock of the basketball club room again in order to arrest the criminal. The criminal who appeared on the scene was an unexpected person.
