The "Twin Star Exorcists" are fated to produce the child prophesied to end the war with the monstrous Kegare... But can Rokuro and Benio get along for five minutes, let alone save the world? On Tsukushima Island, the front line of the battle with the Kegare, Rokuro learns about the origin of the realm of Magano and is thoroughly humbled by the Twelve Guardians. Then he must choose one of 12 elite families to join. Will his decision save his reputation or further damage it...?