Hellmode ~A Hardcore Gamer Becomes Peerless in Another World with Retro Game Settings~

Tags: Academy, Adapted to Manga, Age Progression, Aristocracy, Butlers, Calm Protagonist, Child Protagonist, Childhood Friends, Clever Protagonist, Demons, Dense Protagonist, Different Social Status, Divine Protection, Dungeons, Dwarfs, Elves, Fantasy World, Game Elements, Gods, Hard-Working Protagonist, Harsh Training, Hidden Abilities, Hiding True Abilities, Kingdoms, Level System, Male Protagonist, Naive Protagonist, Nobles, Polygamy, Poor Protagonist, Poor to Rich, Reincarnated in Another World, Royalty, Schemes And Conspiracies, Slow Growth at Start, Strategic Battles, Summoning Magic, Sword And Magic, Sword Wielder, Time Skip, Wars, Weak to Strong