Here's the synopsis:
Boomer is a pretty simple guy for an alien hybrid. He runs on booze, caffeine, and junk food. He works as a bullet-resistant tank for a crew of street-running mercenaries. If someone needs hurting or something needs blowing up, he’s the guy to do it. It might not be the most glam life in Arutairu Megacity, but it’s his, and he’s rather attached to it.
When Boomer's team takes on a shady job with the promise of a stellar payday, the proverbial excrement quickly meets the fan, and hit squads come after him and his crew. Normally, a few amateur goons with guns would just make for good target practice, but he suddenly finds himself unable to protect his friends. His rapidly expanding list of problems soon includes double-crosses, femme fatales, a hybrid assassin wielding alien weaponry, and an army of mercs gunning for him and his rapidly dwindling crew. As if that mess wasn’t enough to deal with, he fears he might be losing his sanity as he blunders into the middle of a conspiracy so vast it will shake the foundations of the entire city.
What’s a dumb grunt like him to do? Get some bigger guns and fight back, of course. And make some bastards rue the days they were born.