The school principal suddenly came up with an idea and suddenly decided to hold a cultural festival. Immediately, they started preparing in a hurry, mainly with the 6th graders, but they didn't have the time or the budget! What will they do at the cultural festival!? Fourth graders, fifth graders, and teachers can't agree on anything at all! At that time, the school principal came up with an idea, so now that’s tough! Can they really do that!? The 13th Ninmyu, in which seniors and juniors work together to create a wonderful school festival, is a lot of fun!! Come on! Grab your invitation and go to the Ninjutsu Gakuen's school festival!