In the wake of an ancient ecological catastrophe, a young woman named Kayo finds herself entangled with a supernatural force after a disturbing encounter with her possessed partner. As she confronts the arrival of a hybrid offspring unlike any known creature, Interplanetary Mutual Observation Agent Muneto arrives to intervene. Tasked with containing the threat, he must shield her from the emerging mutant beast determined to open the path for a larger invasion. Their first meeting sets the stage for a desperate struggle against returning horrors.