After heading off to a duel with the Tasogaredoki ninja, Moroizumi Sonnamon, Mr. Doi has gone missing. While Yamada and the sixth graders begin searching for Mr. Doi, the Tasogaredoki ninja squad leader, Zado Konnamon, and Sonnamon take the podium in the absence of their homeroom teacher in class 1! Meanwhile, Kirimaru accidentally finds out about the situation Mr. Doi is in. Meanwhile, while the sixth graders are searching for Mr. Doi, Amagi, the cold-hearted strategist of the Dokutake Ninja Squad, suddenly appears in front of them. His face is the spitting image of Mr. Doi.