Rushuna is a blonde and incredibly gorgeous Senshi (gun specialist) who traverses the world with one goal in mind. This aims to make the world a more peaceful place by, rather of battling with weapons, removing people's desire to fight by giving them a smile. Although she does not want to fight, she is coerced into it and has exceptional gun abilities. During her quest, she encounters Yajiro, a Mercenary who fights with a sword and accompanies her on her adventure.