Chogi is famous as one of the Ten Great Pupils of Masamune (Masamune Jutetsu) and founder of the Osafune Chogi school. His blades were prized for their exceptional sharpness. As he specialized in long blades, tanto by Chogi are rare. Four of his swords are now registered as National Treasures and three as Important Art Objects. Two of his most famous blades are the Osaka Chogi, owned and prized by Toyotomi Hideyoshi, and the Yatsumata [Eight Legs] Chogi, so-called because it once removed the legs of four men in one stroke.

This example, because of its relative thinness and unusual width, resembles a small wakizashi, which, together with the lively tempering pattern, gives the impression of a Soshu-style blade. This tanto shows very strong similarities to the Osaka Chogi. Liveliness, especially in the typical use of o-midare tempering, characterizes the work of Chogi as an apostle of the Soshu
school in Bizen. This group of So-Den smiths which included Chogi, Kanenaga and Kanemitsu I, exerted great influence within the Bizen tradition, especially in its use of such typical Sagami characteristics as the o-midare/notare hamon, the tight itame hada, liberal use of ji-nie, the hitatsura form of free-floating tempering and the broad proportions of much larger blades.