Owari no Seraph: Kyuuketsuki Shahar

Before the battle in Nagoya, Shinoa's squad receives a rescue mission from Guren: a girl named Riko has been abducted by a vampire called Shahar. Yuuichirou and his companions set out to bring her back, but their target is no ordinary captor and the mission soon becomes more dangerous than expected.

The situation grows worse when Ferid Bathory and Crowley Eusford enter the picture, each with interests of their own. Caught between powerful vampires and a hostage whose fate hangs in the balance, Yuuichirou must decide how far he is willing to push himself to save one human life.