I Transmigrated As An Extra Into A Hero Academy With A Harem
[Warning: Extreme Mature Content]
"Damn, I really got reborn into the novel Love Academia as an extra".
Lee Chang-Min was a successful Playboy and college graduate, spoiled from birth by his rich parents and he had everything handed to him on a silver plater. He had two passions, one which was drawing and illustration which suited his practice as a graphic designer by occupation, and the other is reading online novels by independent writers.
However, his extreme love for e-novels changed his life as an innocent comment due to a unsatisfactory end would open up a new world of adventure and pleasure as he is reborn as Satoru Toshio in the novel he criticized as an extra and is bound by task and tribulations to complete, to which he must to rank up and surpass the main character.
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It all started about a decade ago, in this realm. They had known endless peace and prosperity, with a thriving ecosystem and people living close to what you would call happily ever after. That was until portals opened up breaching the human world with the demon world, allowing them to cross over and feast on the humans. At the same time, people with supernatural abilities began to turn up. The worlds top countries and their leaders came together to form the Yokai Academy with its headquarters situated in Japan. The cooperation was tasked to round up these awakened at the age of nineteen and develop their abilities so as they don't abuse their powers. These awakened individuals were called "Hunters".
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Follow Satoru as he buildings his main character percentage with the help of his mysterious system. Conquering all the demon gates and raking up concubines in his bid to surpass the MC and become the one and only.
Additional Tags/Expectations: Power ups, Nonchalant MC, Smut scenes, Action, Novel fantasy, Slight System trope.