And Her Choice Is Mio decides to let Shido kill her, but Shido objects, deciding to seal her instead so she can live with him and the other Spirits. However, Westcott completes the ritual transforming himself into a Spirit of Origin. Upon saying their farewells to Shinji and Reine, Shido and Mio join forces to fight Westcott. Westcott uses his Demon Kings Belial and Athiel, evil counterparts of Ain Soph and Ain Soph Aur respectively, to try and stop Shido, but Mio grants each of the Spirits access to their full power...