The heart never dies

Alisa is a geoscientist, who is sent on a mission to explore species in undiscovered land, where she encounters the strangest of creatures she has ever met. Some of them are kind and helpful, but there are others who are hungry for her flesh and blood.
What will happen if she ends up giving her heart away to one of them?
Whose side will she be on when the apocalypse begins? Her love or her life?