There is an obake school. At this school, there are no tests or anything. This rumor is on the rise. One day, Yūta tells Mana about his friend who disappeared after saying, "I'm going to become an obake." Kitarō has received many letters about this as well. Yūta says that if you go to the graves on 3rd Street and recite a spell three times, 4th Street will appear and you can get to the obake school. Kitarō tries the spell at 3:00AM and the pathway to 4th Street opens before him. He observes the missing children having fun in their classes at the obake school. What's going on? The teachers are yōkai that have been defeated by Kitarō! The puzzled Kitarō disguises himself as a student in order to find out more.