Toshihachi Kato

After the heartbreak of losing a close colleague, a television star vanishes, presumed to have drowned in Lake Izu. A mysterious empty boat, a forged suicide note, and sleeping pills spark suspicion. As her family—an estranged husband, a troubled son, and a secretive ex—grapple with grief and confusion, layers of hidden pain and deception begin to unravel. What seems like a tragic suicide slowly turns into a web of lies, guilt, and emotional collapse… until the final, devastating truth surfaces

Himeshiro is a wandering yakuza, his father was the best doctor in the eight provinces of the Kanto region, and Himeshiro took over the knowledge of medicine from his father. If he encounters a sick person on the way, he uses his right hand, wrapped in a rosary, to give medical attention, while if he sees a bad person, he draws his sword with his left hand and uses it to punish the evildoers. So he travels on the verge of life and death along the Nakasendo highway...