Magical Girl: The Ultimate Weapon

[Gender Swap: Male to Female + Magic + Transformation + CrossFire + No Romance]

Mian is an incredibly reclusive shut-in.

When his team got wiped out in a game, he angrily smashed his keyboard.

Then he got wiped out too.

He was reborn in a magical world, and turned into a girl!

By a twist of fate, he even signed a contract to become a magical girl.

In this world, the advent of magic rendered muskets obsolete, and modern firearms from Earth never came into existence.

So he decided to combine magic with firearms and make a name for himself!