A doctor has a dummy whose skin is as thin as cicada wings and can clearly see the lifelike muscles and organs. With the help of ventriloquism, products can tell children about the structure and operation of the body in an easy-to-understand way. After the doctor and his wife died in a car accident, his son Leon transferred his imaginary close friend to Pin. He began to use product as an excuse to excessively protect his sister Ursula from her admirers in various extreme ways.