Tahei is Kuma's owner and lived in 1581 worked for Nobunaga Oda employed. In reality, he was Iga spy, because he hid the katana and held with Iga ninja dogs, and his dog, Kuma. Tahei and Kuma were exposed to Ryōga killed Tahein incisions on his belly open katana. Tahei had time to give his katana Kuma just before his death.