A, B, AB, O... These are the common blood types with which most people are familiar, but there are rarer strains in the world, "hidden blood types." Individuals possessing these are called "strangebloods," and they are imbues with incredible abilities by the very blood flowing through their veins. But what happens when all of these disparate blood types come together? The result is rumored to be the legendary "Blood of Wisdom" which bestows god-like power. Little surprise, then, that more than a few unsavory characters are actively pursuing this awesome power. Can Chiaki Kaminaga and his friend Kaguya Daidouji survive this blood hunt...?