Grotesque beings that infest the night darkness— "Yatagarasu," a special exorcism unit that buries and annihilates non-human demonic beings.

Setsuna Yasakani. Sakuya Shukugi. Konoha Watatsumi. And Iwao Tokiwa, who has newly joined the team.

The mission they undertook this time was... A seaside resort bathed in the brilliant summer sun!!

"Wooooooah swimsuits!! Swimsuits!! Boobs!! Swimsuits!!! Will there be a wardrobe malfunction!?"

Oblivious to Setsuna's great excitement, the incident was progressing in the dark. The repeating XX murder case. Grotesque figures roaming the beach. A beautiful amnesiac girl who wandered in. And a call from the sea...

When all the incidents are connected by a single thread, what truth will emerge—