From MangaHelpers:

Tsugiki Shizuka is a gang leader in a major yakuza organization, in Kagami-cho Shinjuku. He and his two closest followers, Isesake Miru and Amano Mia, are well-known and strikingly stylish. In fact, Shizuka is regularly mistaken for a host club worker (to his fury), and some of the other yakuza mock them by calling them a visual-kei band. Shizuka has a pretty good life, though, with money, power, a hot girlfriend, and loyal followers.

Then one day, the higher-ups decide to cut Shizuka's gang loose. Without any yakuza protection, Shizuka is now vulnerable to those who wish him harm. Not only is Shizuka in danger, but his situation puts the lives of his friends and his girlfriend on the line, as well. However, Shizuka is not the sort to run away or allow himself to be killed. He's determined to hold onto his life, to protect his own, and to be an enemy of the yakuza that turned on him! [tethysdust]