The Case Study of Vanitas manga volume 4 features story and art by Jun Mochizuki.

Deep within the bowels of Paris, Noé and Vanitas race through the catacombs with an elite team of chasseurs, the Church's anti-vampire unit, in hot pursuit. Their search for the missing vampires takes the pair down a path all too familiar to Vanitas, bringing them face-to-face with not only an overwhelming curse-bearer, but also with Vanitas's past. Confronted by the horrific menace, what will Noé and Vanitas fight for, and whom will they save...?