Schoolgirl Mitsurugi Saya was already having a bad day, what with being unable to focus on classes, and with her brother in the hospital--and then the zombies attacked! One by one, every boy in school is transformed into ravenous beasts straight out of hell, with appendages designed to spread the demonic infection! She manages to find her friends Amatsuka Maria and Momoshiro Momo, and together they fight back...but do they have the stamina to take on so many zombie boys?!