I Am the Devil King in the Two-Dimensional Empire

Traveling through a parallel two-dimensional world, he became the only surviving descendant of the Demon King and the future successor of the Demon King, and his sister is actually Kagura Nanana? The world is too dangerous. Demons, angels, monsters, demi-humans, and people with special abilities are all gathered together. What should we do if it is so dangerous? What else can I do? I don't know who the Demon King is. I am just an ordinary human being who writes light novels to make money. This is a story about a man who doesn't want to be a big devil, but just wants to be a salted fish enjoying a good life in the two-dimensional empire of his dream. There is already the heartbeat of the angel of the world, Gabrielle Lovelive Date Battle, my sister's magic forbidden Sakurasou... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.