The city of afforestation, Kazamatsuri. In this city which promotes the coexistence of culture and greenery, Tennouji Kotarou is tormented by supernatural phenomena night after night...

Kotarou meets the academy witch, Senri Akane, and joins the occult research club. He starts taking part in occult club activities and gathering club members in order to prove that supernatural phenomena exist.

The occult research club finally begins regular activities. For their first investigation, they search for a tsuchinoko.

Kotarou searches for the elderly gentleman he met to ask him about unidentified mysterious animals.

One day, a letter regarding "Asahi Haruka" arrives at the Occult Research Club, and Kotarou immediately begins an investigation.

With Chihaya and Lucia's disagreement resolved, the occult club resumes activities.

Five days after losing contact with Inoue, Akane suddenly announces that occult club activities have been suspended.

Kotarou is unable to get in touch with Akane, Chihaya, Lucia, Shizuru, or Kotori after the incident in the forest. It is then that a girl appears before him.

Kotarou brings Kagari to the city to help her "find herself" after she gets amnesia.

Kotarou reunites with Kotori, and learns her and Kagari's secret. Meanwhile, someone breaks through the barrier and infiltrates Kotori's secret base.

Chihaya heads to Sakuya's location on Akane's orders. While she is wandering through the forest looking for Kotori's secret base, she discovers a certain person who has collapsed.

Kagari begins to act strangely. Elsewhere, Midou shows up with his Earth Dragon and destroys the barrier around where Kotarou's group is staying.

As the song of destruction echoes across the skies, monsters appear and nature runs amok, destroying the world. Meanwhile, the gang rejoices at Kagari's returning to her senses, but that's when Esaka shows up...

Kotarou se despierta en un pueblo desierto y lo único que sabe es que debe hablar con la chica de la colina.

A medida que la investigación de Kagari continúa afectándola, Kotarou busca ayudarla y se da cuenta del verdadero significado de su teoría de la vida.

Kotarou vuelve a reunir al club de ocultismo por última vez para ayudar a Kagari a terminar su teoría. ¿Llegará a tiempo?

La historia vuelve a cuando Kotarou era un superhumano sin causa, el Cazador que salva la Tierra.

La vida cambia drásticamente para Kotarou cuando Esaka lo invita a unirse a Guardian.

Kotarou regresa a Kazamatsuri, donde Guardian comienza una fatídica operación que termina en tragedia.

Incapaz de quedarse más en Japón, Kotarou huye a una zona de guerra, donde se detiene una vez más. ¿Será capaz de seguir adelante?

De vuelta en Japón, Kotarou se encuentra una vez más en Kazamatsuri, donde se encuentra con bastantes rostros familiares.

A medida que Kotarou se infiltra más profundamente en Gaia y aprende más sobre el grupo, se ve obligado a tomar una decisión que Kagari no necesariamente aprobará.

In order to save Kagari, Kotarou faces off with Gaia and Guardian.

Para reescribir el destino de Kagari, Kotarou se dirige hacia la batalla final.