Mysteries of The Past MoTP

Safrina, a selfless high schooler was forced to band together with Adams, her high school crush, to save humanity. Why? Oracle, the hidden alien, prophesied both Adams and her would save humanity 100 years from now. One would think it would be easy, right? The Earth would be the same as the three had left it but... the group's thoughts were terribly wrong. After waking up from their long nap, they find themselves in a world where Humans live inside a giant snowglobe but... without the snow. The rain? Acid... and there seem to be strange creatures that lurk within the fog, whispering about the past... Can this ragtag group save humanity? Or will Earth be destroyed?