A side story from the popular Granblue Fantasy adventure series. Pommern, a soldier in the Imperial Erste Army, is thrown from a ship, and, guided by a mysterious voice, finds an ancient book on an unnamed island. From there, the story delves deep into his past...

Who must be protected is a still immature "holy mother". Who must be cleansed is a demon who leads people astray. The ones who carry this burden is the student council's vanguard division. The school ground turns into the stage. The curtain of the exorcists' battle has opened!

The souls of the Hakkenshi are reincarnated in the present. Inuzuka Shino is a high school student who shares the name of the legendary Hakkenshi, "Devotion". The name has caused him nothing but stress all his life. Now, because of his name, he's gotten himself wrapped up in a conflict with the Blight, creatures from a giant hole that has suddenly emerged in the city.