Boku no Kokoro no Yabai yatsu

Boku no Kokoro no Yabai yatsu manga summary: 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 murderous impulse that lurks at the very bottom of his soul.