Manga

The master spy codenamed has spent his days on undercover missions, all for the dream of a better world. But one day, he receives a particularly difficult new order from command. For his mission, he must form a temporary family and start a new life?

The Demon King's Daughter Is Too Kind summary: "The Demon King Ariman" He reigns above all in hell. Together with powerfull demons. He seeks to conquer the entire world.However, the Demon King halted his world conquest for a centain troubling matter.