Warau Kyuuketsuki (笑う吸血鬼) is a manga series by Sunhiro Maruo.
While a young boy, just resurrected as a vampire, commits acts of awful ferocity, the city around him shows all its perversion. The adults abuse their power, the boys degenerate and use all the available means to achieve their goal to give vent to their low instincts. Whoever can't understand and make opposition is doomed to change or becoming crazy. So which is the real horror? The vampire who kills in order to feed himself or the crawling disease hidden in society, which slowly corrupts without being noticed?