Magic Bullet in Magic Land

Magic Bullet in Magic Land summary:

The Main Character, Watari Karito, is a veteran player of a Military Shooting VRMMORPG.
The place which he wandered into was another world of swords, magic and gambling. What awaited him there was a demi-human sister and a battlefield full of malice.
If one wants to survive, if one wants to protect ———— He will need to use all means.
He squeezed the trigger.