Magical★Explorer - Eroge no Yuujin Kyara ni Tensei Shitakedo, Game Chishiki Tsukatte Jiyuu ni Ikiru is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

There’s a legendary Bishoujo Game that has become popular among Japanese gentlemen. Its name is “ Magical★Explorer” or Magiero for short. The game’s protagonist has a cheat-like power with12 different beautiful heroines to flirt with, including additional 12 heroines from the DLC, a harem of 24 beauties. I have become that protagonist!………………Not. Instead, I have become the third-wheel character who always laughing like an idiot next to him. There’s no heroine that would lay their eyes on me.
But now I couldn’t care less about the protagonist and his heroines. Why? Because I discovered magic. While I was using it, I have become interested in it. I want to master it. I want to become the strongest. Thus I have decided. I would abandon half my role as a protagonist’s friend to train my magic and then I would beat the hell out of that cheat who can solo the Demon King.
………..I was training with that thought in mind, but somehow I keep getting closer to the heroines and furthermore, I don’t know why I keep encounter events like I am some Eroge’s protagonist.