すだまリレイシヨン

As his mother’s dying wish, he moved from the city to Koubou, where he has memories of living as a child. While there was no meaning or significance to coming back now, new and familiar encounters drag him into the restless “Seven Wonders of the Academy” selection swamp. At Keijou Academy High School, the seven wonders of the academy did not yet exist.

In a land where demons lie, a strange bond is formed. This is a story woven by humans and mountain demons (Sudama).

[From Gematsu]