Takeshi is the oldest of Akakiba's children. He wants to meet his father, but Tiny tells him he was killed by a bear as well as another Akita Inu named Donut. Takeshi is furious and he starts to get thirsty for revenge. He invites Shinji on his journey and along the way, they run into a bear who they think is the same bear because they’re idiots so they attack.
Takeshi and Shinji defeat the bear and afterwards, Takeshi finds out that his mate, Sayoko has went to aid Tiny. He doesn't mind, but he's worried she'll fall in love with him because he’s extremely paranoid.
Takeshi later dies of a heart attack when he learns that his mate is cheating on him with his underage younger brother.