Isshin Ashina is a legendary warrior, attaining the title of "Sword Saint", and the founder of the Ashina Clan. After many years of oppression, Isshin led a rebellion against the invading forces alongside many famous warriors. The Ashina were at last victorious, once Isshin defeated General Tamura in battle. Isshin has an adoptive grandson, Genichiro, who trained under Lady Tomoe. Despite his old age, he secretly goes out at night and fends off the Interior Ministry, as the "Tengu of Ashina".