In another world with my smartphone

While trying to get the hang of leading his nation, sixteen-year-old Grand Duke of Brunhild, Mochizuki Touya, decides to throw a party for the other royals in the region. Touya also continues his search for truth as he visits forests and mountains around his nation. His investigation brings him under the scrutiny of the Pope and the Vatican and he is soon defending his right to be the Grand Duke.