Gakuen Heaven, Vol. 4: A Traitor Revealed - Region 1 DVD

The campus-wide contest is finally over. Kazuki confronts the Vice Chairman with all the evidence he's collected and a few extra surprises of his own. Meanwhile, the others figure out that the traitor among them has been Doctor Matsuoka the whole time. The good doctor's best friend has fallen into a coma because of exposure to the X7 virus, and he will do anything to save him...even make a deal with the devil. Niwa and the others try to out think Matsuoka, but he's already got his claws into Keita, and it won't be long before his plan bares fruit!