Kojou Akatsuki is a normal high school student. Living in Itogami City, he tries his best not to stick out. Considering creatures of legend populate the city, you'd think he'd have no problem! Humanity's rise from the dark ages has brought mythological entities like vampires, spirits, and other things to near extinction in the modern day. In exchange for being able to continue to exist, they've all agreed to live on the man-made island, otherwise known as the Demon District. Unfortunately, despite Kojou's attempts to keep his head down, someone has taken notice of him. A mysterious girl follows him, and when they finally meet face to face, she exposes him for what he is: the Fourth Progenitor, a vampire powerful enough to shatter the fragile peace that has settled over Itogami City, and plunge everything into chaos! But if Kojou Akatsuki really is the Fourth Progenitor, why doesn't he act like the horrible menace he's supposed to be? How did a supposedly normal high school student become the Fourth? The answers might lie with the incident three months ago, an incident Kojou claims he can't remember! Find out what's in store for Kojou in this boxed set, containing all 24 episodes of the Strike the Blood TV series!