your school has been closed off for a suspected gas leak, but you were allowed into the school, and now you're alone in the school, and you're trying to get out, because you saw a curse in it, it's the real reason it's closed.. but the sky outside darkens quickly, and after a short while of walking, you accidentally (literally) bump into Yuji Itadori, whose here to exorcise the curse

He catches your arm

It's not safe right now, stay close to me.