This Heavy Chain, That Does Freeze My Bones Around

Turns out getting Isekaied is not that fun when plot armor doesn't give you a special mission and a team of true friends. After two years of searching for a way back home, Shuji is ready to end it all. Gun in his mouth, finger on the trigger. Until something besides the storm knocks on his door. A intruder, a fierce girl who seems to have escaped from a war zone.

[Isekai - High Fantasy]