Isekai’d With ZERO Skills, He Fused GARBAGE Into an S-Rank Weapon!

What the story is about

After the sun destroys his home world, a socially isolated gamer awakens in a dangerous ruins world where survivors must build shelters and prepare for deadly trials. His unique synthesis talent lets him fuse seemingly useless items into powerful gear, helping him turn from an unprepared scavenger into a resourceful fighter and trader.