Gaku Saitou has fallen, and he’s determined to bring the girl he loves—Maruka Suzuki—down with him. As a newly turned Groan-Up, he wields a demonic power that threatens to eliminate anyone and anything that stands in his way, and Maruka and her friends must give their all just to survive. But a battle against a rank-SSS monster turns out deadlier than they imagined...Will Maruka give in to Gaku’s pursuits? Or will true love finally save the day?