Ryuichi and a group of eclectic strangers embark on a mystery tour to Oka Island, a deserted former mining town. While searching for cryptic "chapters" and navigating the tense dynamics of the group—including a complicated sexual encounter with the man-hating Hiromi—Ryuichi feels an inexplicable, haunting connection to the land. The journey takes a supernatural turn when Ryuichi discovers a mysterious room and encounters a presence that has been calling to him from the shadows.
After discovering a mysterious woman frozen in a capsule, a tour group finds themselves stranded on a remote island with no way to contact the outside world. As Ryuichi navigates the emotional and physical desires of the women in the group, a ruthless killer begins murdering the guests one by one, turning their excursion into a desperate fight for survival.
Ryuichi discovers that Emi is a servant to the sadistic island owner, Yoshimasa, who captures the group to serve as his personal slaves. Amidst the violence, Ryuichi recovers memories of a past life, realizing he is the reincarnation of a boy who loved Wakaba eight years prior. After Wakaba is tragically killed by Yoshimasa once again, Ryuichi makes a final, desperate wish at the Kotodama shrine, leading to a miraculous reunion and the restoration of the island's nature.