After an angel's blunder leads to Shiihara Daiki's demise, he is banished to another realm to conceal the error. In return for his silence, the angel offers him a solitary wish. Daiki promptly requests a Heavenly Castle aloft in the skies. As the ethereal fortress materializes in this foreign land, chaos ensues among the populace. Desperate to reach Daiki, individuals employ diverse methods: some nations resort to aggression to claim the castle, while others extend offers of friendship. Faced with these conflicting interests, how will Daiki navigate this perplexing situation?