Okay, so... not bad.
Tags are completely inaccurate, and I'd suggest that
@YukkuriOniisan maybe fix the tags on their upload...?
As for the gun in a fantasy setting discourse...
Guns in a fantasy setting are OPAF when in the hands of a
trained individual; theres a great video of a Japanese airsoft otaku who goes to the ISA to shoot reals guns, and his muscle-memory makes all the difference; using a real gun is pretty easy.
BUT
Flame control doesn't do anything to powder combustion, and it requires the flames to actually exist; you waould have to cast your spell in the time it takes for the hammer to strike the primer, and then suppress the flames during the 0.0000002 seconds that they exist during the brief combustion where they begin to propel the bullet.
Conversely, I would be VERY HAPPY to take a Wand of MagMissiles; Magic Missiles
Never Miss their target, after all. So shooting 10d6 MagMissiles is like using a Z0RG rifle from 5th Element; one shot, and all the rest track in on the target. (Cant do that with an AK!)
anyway...
Kinda cool manga; I'll put it on hold, for now.