Modern Weapons Cheat in Another World

Ability Steal, Aristocracy, Army, Army Building, Beastkin, Beautiful Female Lead, Cheats, Childcare, Cute Children, Demi-Humans, Domestic Affairs, Enemies Become Lovers, Engagement, Fantasy World, Firearms, First-time Interc**rse, Game Elements, Generals, Gunfighters, Hard-Working Protagonist, Human-Nonhuman Relationship, Kingdom Building, Kingdoms, Leadership, Level System, Loli, Loyal Subordinates, Magical Technology, Male Protagonist, Management, Marriage, Master-Servant Relationship, Military, Modern Knowledge, Monsters, Multiple POV, Multiple Reincarnated Individuals, Nobles, Overpowered Protagonist, Politics, Polygamy, Pregnancy, R-15, Reverse R*pe, Royalty, Ruthless Protagonist, Servants, Skill Assimilation, Special Abilities, Strong Love Interests, Strong to Stronger, Summoning Magic, Sword And Magic, Technological Gap, Transported to Another World, Unreliable Narrator, Wars, Yandere