Seraph of the End (2015)

A devastating virus decimates humanity, leaving vampires to rise and subjugate the survivors, treating them as mere livestock. Fed up with the grim reality of donating blood for safety, 12-year-old Yuichiro Hyakuya and his close friend Mikaela hatch a plan to escape with their fellow orphans. While only Yuichiro successfully breaks free, he quickly allies with the Moon Demon Company, an elite extermination unit within the Japanese Imperial Demon Army, committed to eradicating the vampire threat and reclaiming the world from these monstrous overlords.