Rushuna is a blonde, very beautiful Senshi (gun expert) who travels the world with a single purpose. She aims to make the world a peaceful place by taking away people's will to fight through smiles, rather than by fighting with weapons. Although she does not want to fight, she is forced to do so and displays amazing gun skills. During this journey, she meets Yajiro, a mercenary who uses a sword, and he joins her on her travels.