Manga Tenkuu no Shiro o Moratta no de Isekai de Tanoshiku Asobitai

Shiihara Daiki's death was caused by a mistake from an angel. To keep the incident secret, Daiki was sent to an alternate world. As a form of compensation, the angel promised Daiki one wish, and without hesitation he asked for a heavenly palace that could float in the sky. Astonishment filled the new world when this castle suddenly appeared, resulting in various attempts to connect with Daiki. One nation attempted to steal the castle, while another sought to form a friendship. What will Daiki do in this situation?