Mr. Takumi Karina of "Isengokushi" depicts in detail the adolescence of Shingen Takeda, a famous general of the Sengoku period, who was feared as "the fierce commander of Kai" until he became the lord of Kai.

Takeda Nobutora was a mighty general who unified Kai Province in a single generation. However, he therefore despised his people and killed his best men one after another. His eldest son, Harunobu Takeda (later Shingen Takeda), who believed that people were important, made a certain decision.