Bishop by day and something sinister by night, Frau has managed to hide his “real job” from Teito…until now. On the Hawkzile race that will take them to Hoburg Fortress, Frau loses control and pulls Teito into darkness. Meanwhile, at Hoburg itself, an insurrection fueled by greed draws an older, more terrifying turncoat to reveal himself.
— Description from Comic Vine community (comicvine.gamespot.com).
