Seraph of the End Vol. 17 (manga)

Now that Ferid's been rescued, Yuichiro and the gang regroup at Guren's childhood home. There, Guren reveals a terrible secret--the angel that was summoned with the original apocalypse is trapped inside, and Yuichiro and his friends must work together to defeat it! Meanwhile, Krul is taken to Second Progenitor Urd Geales, the current leader of the vampires. While there, she reveals some old secrets of her own...