Overlord Episode - 1

He quickly realizes that the world has changed; the Non-Player Characters (NPCs) of his guild’s base, the Great Tomb of Nazarick, have gained sentience, emotions, and individual personalities.

As the game’s servers prepare for a permanent shutdown, Momonga stays logged in until the final second, reminiscing about his former guildmates who have all moved on to real-world responsibilities. Overlord Episode 1

The first episode introduces the core cast residing in the Great Tomb of Nazarick: He quickly realizes that the world has changed;

When the countdown clock hits midnight, the game does not shut down. Instead, Momonga discovers he is unable to log out or access game menus. the Great Tomb of Nazarick