Gunota ga Mahou Sekai ni Tensei Shitara, Gendai Heiki de Guntai Harem o Tsukucchaimashita!?
Alternative title: Gun-Ota ga Mahou Sekai ni Tensei shitara, Gendai Heiki de Guntai Harem wo Tsukucchaimashita!?, Kun Ota Chóan-sè Mô͘-hoat Sè-kài, Kō͘ Hiān-tāi Bú-khì Khai Kun-tūi Hō͘-kiong!?, Quand un fana des armes est réincarné dans un monde de magie, il met en place une armée harem avec des armes modernes!?, When a Gun Nerd is Reincarnated to a World of Magic, He established a Harem army with Modern Weapons!?, กันโอตะได้กลับชาติมาเกิดใหม่ในโลกที่มีเวทมนตร์ เล่ม!?, 军事宅转生到异世界, 军武宅转生魔法世界, 军武宅转生魔法世界，靠现代武器开军队后宫！？, 軍オタが魔法世界に転生したら、現代兵器で軍隊ハーレムを作っちゃ, 軍オタが魔法世界に転生したら、現代兵器で軍隊ハーレムを作っちゃいました!?, 軍人再生記 (Classical Chinese), 軍武宅轉生魔法世界，靠現代武器開軍隊後宮!?, 군대 오타쿠가 마법세계에 환생하여 현대병기로 군할렘을 만들어 버렸습니
Story Overview
Hotta Youta, a former hikikomori who worked at a metalworking plant, was a virgin and a high school dropout. He has had a terrible existence since he was a child, and one night when returning home from work, a drug addict stabs him to death. In a dream realm, Youta is reborn as a newborn named Lute, yet he retains memories of his past in contemporary Japan. He uses his understanding of firearms and metalworking to make firearms for himself and his boyhood companion Snow after discovering a rare magic tool known as "Magic Liquid Metal" in order to live in this new world.