To Be a Power in the Shadows!

Academy, Adapted to Anime, Adapted to Game, Adapted to Manga, Antihero Protagonist, Apocalypse, Aristocracy, Army, Army Building, Arrogant Characters, Battle Academy, Battle Competition, Beastkin, Betrayal, Boss-Subordinate Relationship, Brother Complex, Carefree Protagonist, Charismatic Protagonist, Chuunibyou, Curses, Demi-Humans, Demons, Dense Protagonist, Depictions of Cruelty, Different Social Status, Elves, Evil Organizations, Hard-Working Protagonist, Hiding True Abilities, Hiding True Identity, Kingdom Building, Kingdoms, Knights, Lack of Common Sense, Loli, Loyal Subordinates, Lucky Protagonist, Magic, Maids, Male Protagonist, Master-Servant Relationship, Merchants, Misunderstandings, Mob Protagonist, Modern Knowledge, Money Grubber, Monsters, Multiple POV, Nobles, Obsessive Love, Outer Space, Overpowered Protagonist, Parody, Proactive Protagonist, Protagonist Strong from the Start, Quirky Characters, R-15, Reincarnated in Another World, Reincarnation, Romantic Subplot, Royalty, Ruthless Protagonist, Schemes And Conspiracies, Secret Identity, Secret Organizations, S*aves, Special Abilities, Strategic Battles, Strong Love Interests, Strong to Stronger, Sword And Magic, Time Skip, Trickster, Underestimated Protagonist, Vampires, Yandere, Zombies