In the year 2041, Tokyo is the bounty hunter's world - crime is rampant and criminals plentiful. Milla Koroleva, with her killer looks and even more fatal shots, is out to make it big. Enter Kai Toya, child prodigy with supernatural skills, he's even willing to cook and clean - just about everyone's dream partner. That is, everyone except Milla. What ever could be holding her back? Follow this mismatched duo as they take on the most dangerous criminals that terrorise the city and unravel the mystery of Milla's past!