

Teenager Asumu Adachi is at a crossroads. He's about to start high school and unsure of what he wants to do with his life. And as if puberty & homework weren't bad enough, he stumbles upon a huge secret: his new friend Hibiki is secretly an oni! Hibiki & his oni comrades are the only thing stopping the monstrous Makamou from devouring mankind. As Asumu is pulled into a secret war, Hibiki & his allies teach the teenager what it means to be an adult in a uncertain world.
Asumu Adachi and his mother went to Yaku Island for a family reunion. During the boat ride to the island, Asumu meets a man named Hibiki, who has just saved a child from going overboard. On Yaku Island, people are disappearing in the forests and Hibiki goes in to investigate. In the forest, Asumu and his cousin meet Hibiki and also run into a pair of demons known as Douji and Hime of the Makamou. Hibiki goes to fight the Makamou and transforms into an armored figure called an Oni. When cornering one of the Makamou, Hibiki is seen by Asumu.
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Hibiki spends the night at the memorial where Asumu is staying. The next day Asumu meets Hibiki out by the beach and they both talk about what Hibiki does for a living. Asumu witnesses Hibiki transform into the Oni to fight the Hime and her child, a demon-spider called Tsuchigumo. After the fight, Asumu begins to take a liking to Hibiki.