, known as the "Wild Tiger of Kai", was a Japanese samurai of the Sengoku period, who served the Takeda clan. He was known as one of the "Twenty-Four Generals of Takeda Shingen".[1] His younger brother was Yamagata Masakage.[2]
He was the tutor of Takeda Shingen's younger brother Takeda Nobushige. He later betrayed Shingen with Shingen's eldest child, the rebellious Takeda Yoshinobu. A historically accurate account of his life is in the novel The Samurai's Tale written by Erik Christian Haugaard.
thumb|150px|Obu Toramasa, a part of the twenty-four drawings of Takeda (Takeda Shrine Collection)