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.

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.

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 wakes up in a deserted town, and the only thing he knows is that he must talk to the girl on the hill.

Kotarou gets the occult club back together one last time to help Kagari finish her theory. Will she make it in time?

In order to rewrite Kagari’s fate, Kotarou heads toward the final battle.