Professor Agasa takes the Detective Boys out for sushi at a revolving sushi restaurant. After a man acts rude to people in the restaurant, he is later killed with poison! Did one of the customers ahead of him poison him?

Genta's father enters a contest and makes it to the final 3. The man in charge of the contest is found murdered before it can commence. Which of the three contestants did it? Genta's father is a suspect!