In the Colosseum, there was a gladiator girl known as "The Undefeated Blade"—Ramune. Purchased as a slave, Ramune unexpectedly gained her freedom due to a carriage accident. Now free, she sets out to see the world, learn, and experience the kindness of others as she forges her path in life. However, Ramune knows nothing of what it means to be "normal"—not even that it is wrong to cut or kill another person...