Igano Kabamaru
Genres: Action, Adventure, Comedy, Romance
Type: TV, Episodes: 24
Aired: Oct 20, 1983 to Mar 29, 1984
Studio: Group TAC
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
After the death of Saizou, Kabamaru's horribly strict grandfather and Iga ninja teacher (sensei), an old lady, Ran Ookubo, claims that she received a letter from him asking her to take care of his grandson. So Kabamaru runs off with Lady Ookubo to the big city Tokyo to gorge on yakisoba, ramen, chow mein, and attend a regular school—which turns out to have weird quirks of its own. 

(Source: ANN)