Kizuna

Ranmaru Samejima is a skilled young kendo practitioner who catches the attention of Kei Enjoji, the son of a powerful yakuza boss. Kei forms a close bond with Ranmaru based on trust and sacrifice, which eventually develops into a romantic relationship. However, their happiness is short-lived as Ranmaru is forced to give up kendo after saving Kei from an attack, and the pair is subsequently pulled back into the world of the yakuza by a figure from their past.