(Um, Sorry) I’ve Been Reincarnated! - 117 – The Diary Of The First Founder, Azuma

A great demon king who came from another world to conquer Earth. To save the Earth, Li Luyou could only first take care of this great demon king… a little girl proclaiming herself Her Imperial Princess.

- Description from Novelupdates

Nicholas Crowley is used to scraping by in a world where magic is dying. The modern age has left the arcane behind, and the few remaining practitioners fight over scraps like starving dogs. That, however, is no longer his problem. While performing a ritual, something interferes, and his soul is ripped from his body. He awakens during the Class ceremony as Nick, a kid living on the frontier of the Green Ocean, a seemingly infinite expanse of trees brimming with rare ingredients and powerful creatures. Mana is abundant here, and the omnipresent System allows for feats he had once thought impossible. And yet, not everything is as rosy as it seems. Legends walk the land, and Gods require their due. Will his experience as an Occultist be enough to navigate this wild new world?

Liu Yuan is a good game player, especially in the MMORPG Upper Center. Just as he succeeded in gaining the favorability of all the possible characters in Upper Center, he transmigrated. To where? Oops, he transmigrated into the game he was playing.What he saw was a pretty girl. She wept incessantly, failing to notice Liu Yuan’s unusual behavior. She looked up with teary eyes and said in a firm way, “Mr. Junxuan, I will not marry him. I wish to be with you for the rest of my life!” Junxuan… Wasn’t that his username in the game?

The Hero’s party was attacked by a large group of powerful devils. The party will no doubt be annihilated if this were to go on.