A Dream Through Time

When a girl named Sarina a high schooler who doesn't have a very good life is given the chance to go to another world when she sleeps at night. She ends up meeting a boy named Alex who is supposedly going through the same thing she is, they end up switching places with each other where Alex goes to the real world and Sarina stays at that world. But Sarina starts to believe she might have made the wrong decision to stay.