This is Percival or Siv, a warrior of the Chaos world and a great music lover. He also loves to get into fights with the warrior of the Order world. But as a result of the last fight, he lost his girlfriend. Generally, it's not a big deal because Chaos warriors (like Order warriors) simply respawn in their world after death. But a tragedy occurred - there was a mistake in the distribution of souls, and his girlfriend's soul ended up in the afterlife of ordinary mortals. So, there's nothing to do but for the main character to embark on a long journey.