Kiyo heads to school, and Zatch tries to follow. Zatch accidentally gets his toy Vulcan stuck on a track that drives away and chases after it. Suzy tries to tell Kiyo "Welcome back" but is constantly interrupted by Kiyo's friends. Meanwhile, the truck Zatch chases stops and drops its cargo which is revealed to be yellowfish. Kiyo's teacher, Mr. Touyama, gives everyone a test. Kiyo easily answers all the questions except for the final one. At that moment, Zatch crashes through the window, and Kiyo is forced to take Zatch out of the classroom, leaving the test unfinished. When the tests are graded, Kiyo is devastated to find out the last question was worth 30%. Touyama reveals that in Kiyo's absence, he has been teaching the class with random and trivia information in order to break Kiyo's perfect grade. He then tells Kiyo if he "apologizes", then he will tell Kiyo what shall be on the test tomorrow. Kiyo, instead, asks his classmates for their notes and creates study guides for the whole class to get 100%. The next day, Mr. Touyama's test contains questions about his personal life. At that moment, the principal arrives, due to Zatch and Ponygon, and when the principal reads the questions on the test, he orders Touyama to his office. As they head home, Suzy tells Kiyo "Welcome back".
Mentre Kiyo va a scuola, Zatch lo segue, ma Vulcan finisce su un camion e Zatch si mette al suo inseguimento. Intanto Suzy cerca di dare il bentornato a Kiyo, ma viene sempre interrotta dai suoi amici.
Kiyo se dirige a la escuela, y Zatch trata de seguir. Zatch accidentalmente obtiene su juguete Vulcan atrapado en una pista que aleja y va tras él. Suzy trata de decir a Kiyo "Bienvenido de nuevo", pero es constantemente interrumpido por los amigos de Kiyo.
久しぶりに学校へ行った清麿を、歴史の遠山先生が待ち受けていた。いつも自分の授業に出てこない清麿に業を煮やしていた遠山先生は、抜き打ちテストを行うという。結果は鈴芽と同じ70点。翌日も、授業を受けていないと答えようのないテスト。清麿はみんなにノートを見せてもらうが…。
