Seraph of the End, 3 Guren Ichinose Catastrophe at Sixteen

Not only Guren but his closest allies among the Imperial Demons have accepted forbidden power, and the merciless Hiragi Clan orders them to go after its once-favorite but treacherous daughter Mahiru. The vampires, however, are ready to show that no human faction stands a chance against them. Christmas is finally here, an apocalyptic time of year for all good boys and girls.