As a savior, I just want to play stand-alone

Tiandao Kagura has a silent personality, aloof and arrogant, and rejects people thousands of miles away, but his secret identity is the savior.
The reality is autistic and likes to come to the end of the world.
However, the peaceful life began to go wrong.
If the cradle of civilization is exposed, it will face the greatest disaster.
Swing the sword in despair, stand up in ruins.
A mysterious chapter has been opened since then...