A brief description of the manga Realist Maou Niyoru Seiiki Naki Isekai Kaikaku:
Ashta’s castle is rotten. Soon the Demon King woke up. The wisdom of his past lives allows him to rule the kingdom as a realist. He decides to attack the characters of the first level. His goal is to destroy a potential threat: they can gain experience and become strong. Well, it’s a strange strategy. He sends fake banknotes to the country of his enemies.
This is necessary to create chaos in the economy of the enemy’s country and lead them to self-destruct. Instead of silver bullets in the war against werewolves, he shoots nuclei. Ashta decided to correct the trends of the past. He becomes the most powerful Demon King loved by humans and servants alike.