Based in a bar inn of a certain imperial capital, the protagonist is a bounty hunter by trade and returns after finishing a job. That same night, she’s attacked by a mysterious assassin from outside the window. Although she jumps out and fights back, she is suddenly struck by an unexpected new attacker and loses consciousness. When she wakes up, she finds herself in an old hut, hidden deep in a strange forest. The protagonist is confronted by a wanted criminal with a bounty of 10 billion dollars.