(No harem, no formulaic plot, no overpowered protagonist, no System, no idiotic decisions, and no wish-fulfillment. Read with caution if these bother you.)
When I thought it was just an ordinary day, I discovered I'd been pulled into an infinite game.
When I thought I only had to keep playing and collect a million points to go home, I discovered that the game would force a battle for points, driving players to slaughter one another.
When I thought everyone here just wanted to go home, I discovered that someone had actually become an emperor here.