Kanata Tokino's lifelong bond with Hiroki Imanishi anchors the narrative, originating in early childhood and enduring through high school. This connection becomes crucial when Hiroki sacrifices himself to save a girl during a nighttime accident, resulting in his physical death and spiritual detachment. Following Hiroki's demise, Kanata uniquely perceives and communicates with Hiroki's disembodied spirit while observing Hiroki's body moving autonomously, visibly unharmed. Suspecting possession, Kanata confronts the physical entity, provoking a violent assault from the controlling spirit, Fhalei Rue, who attacks using Hiroki's body.

Kanata's profound emotional ties to Hiroki manifest as tangible radiant light energy within a fantastical dimension accessed during a near-drowning. This energy embodies their bond's intensity, serving as a counterforce against hostile spiritual entities. In that realm's climactic confrontation, Kanata's emotional resolve directly challenges Fhalei Rue's claim over Hiroki's existence. Kanata subsequently aids in restoring Hiroki to life after Fhalei concedes and triggers temporal reversal. Both reappear physically unharmed on a beach, witnessed by concerned classmates, and reunite with an embrace echoing childhood gestures.

Kanata's background remains exclusively defined by his relationship with Hiroki. His narrative role centers on this connection and the spiritual repercussions of the accident.