The mechanics of her survival/return differ as the "Beyond the Boundary" entity itself is handled differently. Relationship
looked down at her hands, flexing her fingers. "I thought so too. I had used up all of my blood to save you from the youmu. I shouldn't have been able to keep a physical form. But then... I felt something pulling me back. A feeling so strong it carved a path straight through the void." She looked back up at him, her eyes shining with unshed tears. "It was you, wasn't it? Your voice reached me." beyond the boundary light novel ending
Described by readers as more focused on supernatural action and specific character-driven subplots not seen in the show. The mechanics of her survival/return differ as the