Highschool DxD: I have a Dimensional Travel System

After transmigration or perhaps reincarnation, Mahiro Toma decided to pursue a career as a light novelist. However, everything changed when he read the name of his new school on the notice board. "Wait, Kouh Academy?!" "Isn't this the school from Highschool DxD?" This is the story of a man who finds himself in the fantasy world of Highschool DxD with the unique ability to travel to various anime worlds to grow stronger. Worlds: 1. Highschool DxD 2. Is It Wrong to Try to Pick Up Girls in a Dungeon? (Danmachi) 3. Sword Art Online (SAO) 4. ... --- For advance chapters: patreon.com/heavenlydawn Please Note: I do not own any of the content in this fanfiction. The copyrights belong to their respective creators. — Description from novelcodex.org