The assault on House Bordeaux continues with a fresh wave of terror. Count Malta has concocted a deplorable new plot—one that could bring Bordeaux to its knees. Meanwhile, his helper, Charlotte, launches an attack of her own and strikes at the heart of Bordeaux’s defenses. With nothing as it first appears, the party struggles to face their foes. Can Belgrieve and Ange see through the enemy’s deceptions and save House Bordeaux from destruction?

Retired adventurer Belgrieve thought he was done with excitement...but his peaceful life is upended when he discovers a baby abandoned in the nearby woods. As her adoptive father, he teaches his new daughter Angeline everything he knows about the adventuring life—a past he had thought long forgotten after he lost his leg in battle. Angeline idolizes her father and wants to follow in his footsteps, so she leaves home for the big city. As the years pass, she ascends the ranks, eventually becoming renowned as an S-Rank adventurer: the Black-Haired Valkyrie. But it turns out that being the best comes with its own struggles, and she can barely catch her breath between battling fiends. With everyone turning to her for rescue, can Ange get out ahead of each new disaster and finally reunite with her beloved dad?

Ange and her friends stop in Bordeaux, home to Seren, Sasha, and Helvetica, on routine business. However, they couldn't have chosen a worse time, as the town is under threat by malevolent forces: a power-grabbing noble and a mysterious child who wields dark miracles. Things come to a head when the party’s visit is thrown into chaos by an army of undead fiends! Beset on two fronts, the S-Rank party must fight to defend nobles and townsfolk alike—and the fate of House Bordeaux hangs in the balance.

Thanks to a strange turn of fate, Angeline was able to reunite her father with one of his former adventurer comrades, the archmage Kasim. Now with spring approaching, Belgrieve intends to bring everyone back to Turnera with him, but the unbreakable bond between father and daughter has left the two so concerned for one another that they ironically can’t seem to find common ground. Meanwhile, Charlotte and Byaku begin training in magic, only to encounter a certain problem. Where is this ever-growing little family headed, and what will become of the young magicians-in-training?