Dominators Realm

After defeating the titular antagonist in his favorite internet game, "Avlora," a certain individual who held responsibility for it thought it would be all over. However, that changed when the reward for the quest offered him into a boss monster that he and his comrades had defeated after days of battling. It was something hard to refuse for a youth like him, but the outcome of his desire was not what he expected. Betrayed comrades, a fallen antagonist, and a new world were things he wasn't prepared for.

But With his newfound power, the certain individual, Leviathan, is soaring higher than we can even imagine.