Titan Slayers

Aliens called Titans landed in 2037 and they hunt us in seasons for the past 100 years. If you take an arena fight against a Titan and live, the season is suspended until the next Titan Tournaments. Heads trade on an open market, four heads for four million credits. People who do that for a living are called Titan Slayers. There aren't many left. A woman who grew up watching her parents fight…