The battle against the White Whale has concluded, but Subaru's fight is far from over. He knows the Witch Cultists have their eyes on Emilia, so he's brought forces-including Julius the knight, of all unlikely allies-to ambush them and crush their scheme. But when things go a little too smoothly against Subaru's nemesis, the "Archbishop of Sin" Petelgeuse, a suspicion lingers: Is there something vitally important they've failed to realize...?