After Akihito Kanbara and Mirai Kuriyama, who he believed had vanished after defeating Beyond the Boundary, reunite, Akihito discovers the heartbreaking truth that Mirai has lost all her memories. She cannot remember him, her friends, and her past as a Spirit Warrior. Despite his devastation, Akihito realizes that Mirai now has the chance to live a normal life away from the supernatural society that shunned and exploited her. However, this comes with a steep cost - Akihito and his companions must conceal Mirai's true identity from her and avoid befriending her. Unfortunately, Mirai's suppressed memories gradually return, and a new sinister presence sends a group of shadow-like creatures to find her. As circumstances worsen, Akihito must defend himself, his closest friends, and his beloved bespectacled beauty, Mirai, to keep them all safe.