Ranmaru Samejima, a talented kendo practitioner, catches the eye of Kei Enjoji, the illegitimate child of a yakuza leader. Kei, longing for a connection with Ranmaru, nurtures a relationship founded on loyalty and selflessness, evolving into a deep affection. When Ranmaru rescues Kei from a violent yakuza assault, he is compelled to bid farewell to kendo forever, binding the two in unwavering trust. Determined to stand by each other distanced from the yakuza realm, they embark on a life together as partners. Yet, as a shadowy figure reemerges from their past targeting Ranmaru, their peaceful existence is shattered, drawing them back into the perilous world they sought to escape, testing the endurance of their love.