Name of the Oracle

Celia and Nors raised at the Nova Academy of Magic.
and grew up to be extremely good magicians.

But during a promotion ceremony, they were suddenly attacked by a group of unknown people.

These people were armed with unknown weapons and killed many people instantly.

This kind of unknown people also appeared all over the world one after another, where did they come from? Are they good? Are they bad?

As they went deeper and deeper into their exploration, they realized that their world had actually become someone else's playground, and the world they were in was actually from a holographic game called [Oracle Name].