Military Otaku Reborn in a Magical World, Building a Harem Army with Modern Weapons!?

Ryuto, a young man reincarnated in a magical world, will use modern weapons to create a legend──!Ryuto──a young man who died in an incident and was reborn, only to find himself reincarnated in a world of magic.In this world where magical talent can determine one's life, his magical power is pitifully low.Therefore, he used modern knowledge to create "guns"──he "used to be" a "military otaku" who loved weapons!With the unfulfilled desire of his past life to save others, Ryuto strives to create weapons to protect his childhood friend, Shirayuki, a dog-eared girl, from the approaching monsters!This is a story about a young man who eventually created his own exclusive army (harem), using that power to save people──perhaps it will become a legend!