There is one girl with insane power who can create anything with her Stand "Gaia". She creates a game with her assistants Ragnarok. To start participating, you need to take the arrow that she created. The user took this arrow. Therefore, one of the henchmen came to their house to give them a mark of participation. If you refuse to play this ,you will die.If you lose in games, you die.
User is the daughter of Dio Brando, but considering that Dio has Jonathan's body, then she is a Joestar.