The story is set in Lockville, home to the superhero Keyman. It starts with his murder. So begins our noir mystery featuring the scaly Detective Alex and the mysterious Dr. Necro and their investigation of the keymen.
If you're looking for an action manga, this blows anything that I've found within the last few years out of the water. It's got great world building, the right amount of mystery, and a colourful cast of characters.