Hana to Tsuki

Kanzaki was picked up by the yakuza Sugawara when he was young and managed to survive. Sugawara eventually took over as clan leader, and Kanzaki came to support Sugawara as his right-hand man. However, the clan has already begun to decline, and Kanzaki spends his days cleaning up the mess left behind by the former head of the clan. In the midst of all this, he learns that Sugawara sleeps with a yakuza from another clan in order to protect their group. Kanzaki begins to work alone in the dark to put an end to all this... What will become of the twisted love affair between the cold-hearted Yakuza and the aloof gang leader?

(Source: Kaiohsha, translated)

Included one-shots: Tsuki no Terasu Saki, Hana to Raine