Apocalypse Beast Master

Betrayed and murdered in her past life, Riley is reborn to the exact moment of her academy's familiar selection. Victoria, her hypocritical rival who was also reborn, instantly steals Riley's F-tier Brown Bear—the key to surviving the impending Ice Apocalypse—and dumps the seemingly useless SSS-tier White Fox on Riley. But Victoria is unaware of two fatal secrets: the Bear remembers the past and is secretly working as Riley's double agent, and the White Fox, once bound by a Blood Pact, is an apocalyptic powerhouse!