The everyday Sanyo family gets an unexpected surprise in the shape of a new lodger-Hattori is a ninja boy who has come down from the Iga mountains to attend normal school. Befriending Kenichi Sanyo, who is the same age as he, Hattori starts attending school undercover, occasionally accompanied by his brother, Shinzo, Shishimaru the ninja dog, and Kenichi’s girlfriend, Yumeko. The gang is also threatened by the rival Koga ninja, Kemumaki, and his evil sidekick, Kagechiyo the Shadow-cat.
- Other Title: Ninja Hattori-kun (2012), 忍者ハットリくん (2012年版), Ninja Hattori Returns, 忍者ハットリくん, 忍者ハットリくん (2012年版)
- Status: Completed
- Sub/Dub: Anime Sub
- Anime Type: TV
- Genres: Comedy, Martial Arts, Shounen, Slice of Life, Action, Romance
- Characters: Hattori, Shinzou, Hattori, Kanzou, Kawai, Yumeko, Kemumaki, Kemuzou, Mitsuba, Kenichi
- Score: 6.57
- Rank: 6233
- Popularity: 9659