404 GAME RE:SET ProloguE -エラーゲームリセット プロローグ- is a simulation game developed by SEGA CORPORATION for Android devices. It is a prequel to the official release of 404 GAME RE:SET -エラーゲームリセット- scheduled for April 25, 2023. The game is set in a world where SEGA has manipulated young girls called "Cast" to change the world according to their convenience. The game follows the story of a hero fighting to save these girls and restore the world to its original state.

The game offers an opportunity to experience the world and the characters with some of the game's features like "Battle" available for play. The game also features a unique mystery element that players can explore for themselves. The game is a shooting RPG that is easy to play with an auto-operation system. The game does not have any character development elements in the Prologue version, and players can enjoy the game's exciting battles. Note that the Prologue version and the official release of 404 GAME RE:SET -エラーゲームリセット- are separate apps and require separate downloads.