Seraph of the End (Seasons 1–2)

Seraph of the End (2015) is a post-apocalyptic vampire anime you can watch online on iFILM. A sudden virus kills everyone older than thirteen, and vampires rise from underground to herd the surviving children like cattle, farming them for blood.

Orphan Yuichiro Hyakuya survives that nightmare but loses nearly everyone he loves. After a failed escape from the vampire city, he enlists in the Moon Demon Company, an extermination unit of the Japanese Imperial Demon Army that arms teenagers with cursed blades to fight back. Running alongside his story is the fate of his closest friend, Mikaela, whose arc complicates any easy line between human and monster. The weapons themselves are bargains with literal demons, which keeps every battle costly.

Adapted from the manga by Takaya Kagami and Yamato Yamamoto, the series was animated by Wit Studio, the team behind Attack on Titan, and it shows in the kinetic fights and ashen colors of a ruined Japan. If you want dark fantasy that leans hard on loyalty and betrayal, this delivers. Stream Seraph of the End online on iFILM.