Igano KabamaruIgano Kabamaru.

Igano Kabamaru (伊賀野カバ丸) is a Japanese manga series written and illustrated by Yū Azuki. The eponymous protagonist is a naive young ninja from the Iga province called Kagemaru (absolute shadow), nicknamed Kabamaru (hippo's mouth) for his insatiable appetite. Following the death of his strict grandfather and ninja sensei, Kabamaru moves to Tokyo with one of his grandfather's acquaintances.