Takamaru was an Iga ganin.


His master trained him and his fellow ganins Akame and Kikumaru to wield swords and fight humans in war.

His master was killed by Oda Nobunaga's men and Koga ganins who had joined them. He and Kikumaru ran with the secret technique scrolls of Itou while Akame stayed to delay the enemies.

He eventually stayed with Akame, Kikumaru and master's son Kotaru. The Itou family carried on existing.