The monkey was asked by Goda, who lives in a mansion, to unlock the lock of the warehouse that the key could not be found. Paintings, pottery and antiques were stolen from the warehouse. After this, thieves enter the shops in the shopping district in succession, and the monkey infers that the crime was committed by a professional key master based on the situation at the scene. Meanwhile, Monkey, Yamamoto, and Yamada hold a joint party with Minami Nishiyama, an adult who started a part-time job at a fruit shop, and her friend. The monkeys enjoy a joint party with Arasa, who proposes a game with a kiss, but Yamada is informed that a thief has entered the shopping district again. Later, Yamada and the detective come to the Sarumaru key store. The detective tells him that he will arrest the monkey on suspicion of continuous theft of the shopping street.
