The Unimplemented Last Boss is my Friend

This is the story of Syutaro, a young man who was chosen from a pool of 100,000 people as a member of the second group of players for the new VRMMO [Eternity]. When he finishes selecting random skills on the character creation screen, he is given the [Dungeon Creation] skill and becomes trapped in a game of death with approximately 350,000 other people. Syutaro accidentally activated the Dungeon Creation skill at the same time the Death Game began, and due to a bug in his coordinates, he found himself in the final area that has yet to be implemented, the [Los Maolas Castle].