The Game of Swordsmanship Among the Heavens

When I woke up and encountered a bloody sky, I started my journey of killing monsters and upgrading. (First person in the Sword Chapter) ("Sword Art Online" (End)... The rest is to be determined) (The protagonist has no motivation to move forward and just goes with the flow) Goldfinger: Inherit the ability to travel through the world. If you travel into the game, you can gain the ability to freely switch the world into digital form.