I'll be as direct as possible since this is my first review and I don't really know what I should write.
The story starts in a peculiar way and can grab the attention of most readers, specially if you're into shounen and yakuza styled manga. With that said, don't get your hopes too high because it's only 25 chapters, not nearly enough to finish a story with this kind of plot, making it have an open ending. The character development is average and a bit vague, making you don't care about what happens to who.
It's a shame it ended up being a disappointment since I was looking forward to reading it.