So, get this – an angel messes up and accidentally kills this dude named Shiihara Daiki. To cover it up, they send him to another world. And get this – the angel offers Daiki one wish to keep quiet about the whole thing. Daiki’s quick to ask for a floating Heavenly Castle in the sky.
Next thing you know, bam, there’s a floating castle in this new world and everyone’s freaking out. People are trying to reach out to Daiki in all sorts of ways. Some countries are trying to steal the castle, while others are trying to be buddies with him. What’s Daiki gonna do in this crazy situation?