Source - https://www.novelupdates.com/series/modern-weapons-cheat-in-another-world/
Description [Edit]

Nagato Kazuya, a “Military Nerd” high school student who gains the ability to summon modern-day weapons and soldiers, when he reincarnated into another world.

Together with his summoned yandere military advisor, soldiers and modern-day weapons, they will conquer the land, seas and skies of a fantasy world.

These are the unparalleled existences of his yandere harem and their stories of combat.
Associated Names [Edit]
Bringing Modern Weapons to a Fantasy World
Fantasy Sekai wo Gendai Heiki Cheat ga Iku
ファンタジー世界を現代兵器チートが行く。