Life of an otaku with transmigration system

In the bustling city of Seoul, a seemingly ordinary 25-year-old man had spent eight years as a dedicated soldier, serving his country with unwavering resolve. However, after retiring from the army, he start to watch animes, mangas and novels. Soon, he found himself no different from the passionate otaku community, living a life as a Shut in. One fateful day, while engrossed in his favorite anime series, he received an enigmatic email from an unknown sender. The message posed a series of intriguing questions: "Have you ever yearned to step into the fantastical realms of anime? Do you aspire to become the overpowered protagonist of your own story? Have you ever dreamt of amassing an epic harem of characters? If your answer is 'yes,' then simply respond affirmatively, and I shall grant you these desires." The mysterious sender claimed to be an "outer god" seeking amusement to break the monotony of his immortal existence. They had selected our protagonist at random, assuring him that he was far from unique. Refusal would result in the offer being extended to another fortunate soul. Intrigued and driven by curiosity, the young man accepted the offer, and from that moment, his life took an astonishing turn. But that was just the beginning. ................................................................. First world: Tokyo revenger ( Will be at most 40 chapter or more ) Second world: Pokémon ( will be at most 50 or more chapters ) Third world: Naruto ( Will be more than you expected) Fourth world: Original world ( Only for 10 to 20 chapter ) Fifth world: ??? Sixth world: ??? Seventh world: ??? Main heroine: Senju Kawaragi ( She will appear in chapter 4 or 5 and she is from Tokyo revenger Arc ) Tokyo revenger Arc will be a AU since I plan to make kawaragi born on the same day as sinichiro sano so that the romance will be realistic as possible. This book will be Non - harem for now but would change if you The readers all want it. If you like it, just add it to your collection or library So that you won't miss a single chapter and you don't have to give power stone cause my work is fanfic and I won't earn even a single cent so you don't have to bother by giving me power stone..... cover isn't mine and if the creator want it to be removed then contact me through my book's latest chapter...