So I Reincarnated in a Magical World as a Nobody Captain

Themes: siblings, multiple female love interests, magic, school, derivative adaptation...

The first volume is rather tearjerking. The story will continue with extras and a rebirth arc for the protagonist.

In a world where humans with magical powers are on the verge of extinction, the pinnacle of combat shifts from wielding a sharp sword, to using magic, and then to firearms. The male protagonist, Sanzhi Jianghuai, attends the Anti-Magic Academy, an institution that trains students in the Inquisitor profession to eliminate the remaining threat of magic. He is an unconventional sort who cannot use firearms at all, and faces his enemies with nothing but a single blade...