In the Colosseum, there was a gladiator girl known as the **Unbeaten Sword** — Ramune. Bought as a slave, Ramune unexpectedly found freedom after a carriage accident. The girl, now free, sets off to see the world, learn, and experience the kindness of others as she lives on. However, Ramune doesn't know what "normal" is. She has never been taught not to slay people, or that killing is wrong...