

Something's gone terribly wrong with Eizan's father's rice ball business. All the costumers are complaining about the rice balls. They taste like dirt. It's awful. Business is falling off in landslide proportion. And Eizan soon discovers that the only thing worse than all those rice balls is no rice balls! With the rice ball business going bankrupt, Eizan's family is going to have to move and go back to the family farm on a distant island ... which means Eizan will have to move with them! Which means no more Shuriken School for Eizan!!!
Bakufu, the famous Ninja master, literally drops out of sky (hence the hole in the school's roof) and offers to teach at Shuriken School. The Principal doesn't dare refuse, but Bakufu's fee is exorbitant.
As the School prepares to celebrate the anniversary of the town's foundation, a mysterious Ninja from Katana School makes off with Tokiro's (the city's father) famous flip-flops. According to tradition, Shuriken presents these flip-flops to the public during the commemorative parade. If Shuriken School cannot produce them, the school's entire assets will be handed over to Katana School!