i want to play happily because i got the heavenly castle

a brief description of the manga i want to play happily because i got the heavenly castle: an angel made a mistake, resulting in shiihara daiki’s death. in order to hide the mistake, he was then sent to a different world. the angel will grant him one wish as a payment for keeping it a secret. daiki asked for a heavenly castle floating in the sky without hesitation. suddenly a floating castle appeared in the new world, which causes confusion amongst the people. they attempt to contact daiki in various ways. a country tries to steal it by force, while another seeks to befriend him. what in the world would daiki do?