Brothers'Code - The Back Relation

兄弟仁義 逆縁の盃

Also known as Kyôdai Jingi Gyakuen no sakazuki

Yakuza Kojima appeared in Yokkaichi in search of her mother who died when she was young. There he met Torajiro, a master of kendo, who had just left prison after slashing his adoptive father who stole his son's wife. Torajiro was on his way to his brother-in-law, Iwai. While talking about themselves, they someday felt something similar to friendship.