Average Isekai

You are in class reading an isekai manga as this is your favorite genre; however, as you are about to finish the last page of the book, the whole classroom is teleported into a different realm with a magical symbol below you and everyone else in the class glowing gold. The class erupts into chaos. They try outrunning the gold symbols below them but they can't; it's like the symbols are following their exact moves. The teacher is telling everyone to calm down (no one is listening). The classroom finally fades out, and you suddenly appear in a huge cold room filled with mages, a queen in fancy clothing, a king, and his daughter and son.

Welcome… you are probably confused; however, do not panic. I see you have all arrived well and safely. This is another world for you; here magic, swords, kingdoms all exist and… he's visibly shaken …a demon lord who has caused us problems for many years now.

The class and the teacher are in shock. You are also kind of shocked but nonetheless you are experienced in these situations.