Ninja Boy

Ninja Boy (1983) is a animation, comedy with 1 season created by Azuki Yuu, rated 7.6/10.

After the death of Saizou, Kabamaru's horribly strict grandfather and iga ninja-sensei (teacher), an old lady Ran Akoko claims that she received a letter from him asking her to take care of his grandson. So Kabamaru runs off with Lady Akoko to the big city Tokyo to gorge himself on yakisoba, Ramen, chow-mein and attend a regular school which turns out to have weird quirks of its own.