Seraph of the End

The story takes place before the "Battle in Nagoya" arc in the main plot. Guren assigns the Shinoa Squad a new mission: rescue a human girl named Riko from a vampire called Shahar and return her to her family. But when Ferid and Crowley show up, also hunting Shahar, the situation grows complicated. Now, Yuuichirou must find a way to save Riko before it's too late.