Typical yakuza story, nonetheless nice to read
Synopsis:
Kuroi has been asked by his childhood friend Shirakaba to join the Yakuza just like him, but he always forbade it. Turns out that Shira was in love with Kuroi for the longest time, even having a sexual relationship with him until Kuroi told him that he would never let him join the Yakuza. Until they were 38 they both got married and divorced once, Shira became a lawyer so he could finally get accepted in the group by the head of the group. At this point Kuroi accepts his love and they both officially start dating.
Naked Sword and the Tree Peony of Black