A new surprise arrives at the everyday Sanyo family: Hattori, a ninja boy from Iga mountains who comes to attend normal school as a new lodger named Kenichi. Initially befriended by Kenichi, Hattori starts attending school undercover and is occasionally accompanied by his brother Shinzo, Shishimaru the ninja dog, and Kenichi's girlfriend Yumeko. The gang faces threats from rival Koga ninja Kemumaki and his evil sidekick, Kagechiyo the Shadow-cat.
Ninja Hattori
Hattori, a ninja boy hailing from the Iga mountains, has joined the Mitsuba family alongside his brother Shinzo and their loyal ninja companion. He frequently assists Kenichi in resolving his issues while keeping a vigilant watch over him, acting as a close friend.
