So this story is based off the anime "Gargantia" It's on Netflix if you want to watch it. Sinbad is the prince of the planet Sindria. He's better at swordsman ship than usual guards and some other nameless people. But there was one person who he couldn't beat. Jafar, his guard and best friend. Both of them were caught in war with the planet Kou. And in that war, Jafar and Sinbad lost consciousness in their tanker and when they woke up, they weren't anywhere near Sindria or Kou. They were on a full water placed planet.