시즌 1, 에피소드 1: Eizan has to help his dad make rice balls for the Tokirohama Bonanza Weekend and he's so tired he fails his school exercises. To motivate him, Okuni secretly signs him up for the Martial Arts Festival Competition, scheduled to close the Fair. The organizer is no other than the leading Ninja Equipment supplier for all schools - Mister No. He bumps into Kita at the mall, one of his old classmates. He sneers at her because her career has lead her to teach in the most 'rundown Ninja school in town'. Stung to the quick, Kita answers back by betting that Shuriken will win his competition. Mr.No accepts the bet, but If Shuriken loses, he wants all the school's overdue payments to be settled at once. In other words, Shuriken's survival is in Eizan's hands...