Monstaboo, Vol. 4 (manga)

Academy Game mastermind, Gaku Saitou, has fallen for Maruka. His forbidden love transforms him into a Groan-Up befitting of his true nature...and sends him on a rampage destroying everyone and everything standing in his way. Can the students stop him before Maruka falls into his clutches? Or will they have no choice but to face despair? Find out in this epic final volume.