Infinite Dendrogram (Manga) Volume 8 by Sakon Kaidou

As the clash of the superiors draws to a close, a terror looms over the city of Gideon. Mr. Franklin, the Giga Professor from the Dryfe Imperium, makes his terrifying debut! Both admirably cunning and incorrigibly heinous, the sadistic scientist sets his sights on throwing the city into utter chaos. But as luck would have it, Ray, Marie, and Rook have a front row seat to his psychotic show, and they're not about to go down without a fight! Though outmatched, outnumbered and outsmarted, the knights and Masters of The Kingdom of Altar swiftly move to retaliate. They have the spirit, no doubt, but will it be enough to defeat the mastermind?