One Soul, Two Bodies, but I Can Load Games

Shiraishi transmigrates, and his soul splits in two, giving him two bodies at once: a handsome black-haired boy and a silver-haired, red-eyed girl. In all kinds of worlds filled with danger, he is fortunate enough to obtain a System that lets him use the abilities of game characters. But the person it's bound to is the silver-haired, red-eyed girl... Faced with an onrushing demon, Shiraishi calmly pulls a brand-new handgun from his pocket. With a bang, the cold muzzle flashes with searing fire, and a golden bullet tears through the air, burrowing into the demon's chest. The powerful impact sends the demon stumbling back several steps. It clutches its wound as blood seeps between its fingers, its face turning deathly pale as terror spreads across it.

"Th-this definitely isn't an ordinary gun. Why has my healing slowed down so much? What is this?"

"American-style quickdraw, kid."

Shiraishi pulls the trigger again. (I'm not good at writing blurbs, so please check out the main story. Infinite-worlds adventure. Demon Slayer, Re:Zero, and Fire Punch are currently underway.)