As one of the successors of Yoshitaka Igasaki, their grandfather and the Last Ninja, Takaharu always looked up to him and wishes to become like him. Takaharu also wanted to inherit the Last Ninja title and would lecture anyone that tarnishes his grandfather's pride. While on his way to his family's dojo, an army of Hitokarage destroyed it, with Takaharu transformed for the first time as Akaninjer, the Fiery Ninja, whose signature attack is the Ninja Fury Slash and eliminate them. After reunited with the other Ninninger candidates, Tsumuji Igasaki, his father leads them to Gengetsu Kibaoni's resting place, which was sealed by Yoshitaka until the Sealing Shuriken were released by the revived Gengetsu and wandered off to various part of the city.
After the final battle against Gengetsu Kibaoni, Takaharu opens his own school of ninjutsu and is last seen teaching his students.