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?

Benio learns both why Rokuro ran amok at Hinatsuki Dorm and a secret about her beloved brother. Then, when a friend is possessed by the curse of the Kegare, Rokuro is faced with a terrible decision...