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?

The battle against Yuto rages on, but without Benio, Rokuro can't access the power of the Twin Stars. Or can someone replace her...? Then, the tragic reason Yuto became a Kegare is revealed...