Slasher Maidens, Vol. 1

Around the world, a phenomenon is observed where those whose mental stress reaches a peak transform into monsters called Kaijin and succumb to murderous impulses. Such supernatural events were completely unrelated to proud pervert Asuma Sudo, but after he transfers to an allgirls school while chasing the girl of his dreams, he discovers that the school was actually a front for an antiKaijin special agency