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Hailing from the mountains of Iga, Kanzo Hattori moves in with elementary school student Kenichi Mitsuba and his family to hone his skills as a ninja.
Kenichi is just an ordinary boy until he met Hattori who is a ninja. Because of his helpful nature, Hattori along with his brother Shinzo and his ninja-dog Shishimaru stayed in Kenichi's house and inevitably changes Kenichi's daily life with the infusion of the ninja background he comes from.
Way out in the sticks, the fourth-graders of the local school in Tokio village all have their own superpowers of doubtful merit, including flying eyeballs and missile-hair. Ippei and his friends study hard to be ninjas, but they are constantly under treat from the arrogant cheats from the neighbouring village of Techno.