Days in an Apocalypse-Era Abandoned Village

There’s a System, there are supernatural abilities, and plants and animals are mutating.

The protagonist is a laid-back sort. Unless something unexpected happens, there should be no heroine.

An orphaned college student returns to his village to live alone. As the world begins to change dramatically, he unexpectedly discovers that it is advancing to a higher level. Watch how he responds as the world is reshuffled.