100 Dollar wa Yasu Sugiru

Petey is a bounty hunter in a time and place full of bounty hunters. The criminals are outnumbered by the bounty hunters and whenever a wanted poster is posted, it doesn't stay up for long. Except for one... there's one wanted posted with a negative bounty and no one wants to catch this criminal. But Petey is curious and she seeks the help of a mystery solver...

(Source: MU)