Boku No Kokoro No Yabai Yatsu is a Manga/Manhwa/Manhua in english language, School life series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

A "fearsome psycho-thriller" centering on "the dark side of adolescence." The manga centers on Kyōtarō Ichikawa, a person at the very bottom caste of his school, and who hides murd3ro0s impulse that lurks at the very bottom of his soul.