There was a girl gladiator who made a name for herself at the Colosseum. Her name was Ramune, the "Unbeatable Sword." Ramune was bought as a slave, but an accident in a carriage unexpectedly freed her. The girl lived her life seeing and learning about the world, experiencing the kindness of others. However, Ramune did not know what was "normal." She did not know that one should not slash at people, and that one should not kill people.