Dokumushi Kozou

Sanpei is bullied at school and mistreated at home. His only real friends are his pets. But when he gets stung by a strange insect, Sanpei's life changes forever! Transformed into a huge poisonous bug, he escapes to discover the world outside. There he finds only more hatred, and eventually he returns to exact a terrifying revenge.

The Hino Horror series:
Hino Horror Volume 1: The Red Snake (赤い蛇 Akai Hebi)
Hino Horror Volume 2: The Bug Boy (毒虫小僧 Dokumushi Kozou)
Hino Horror Volume 3: Oninbo and the Bugs from Hell (地獄虫を食う! 鬼んぼ Jigoku Mushi Woku! Oninbo)
Hino Horror Volume 4: Oninbo and the Bugs from Hell 2
Hino Horror Volume 5: The Living Corpse (死肉の男 Shiniku no Otoko)
Hino Horror Volume 6: Black Cat (黒猫の眼が闇に Kuroneko no Me ga Yami ni)
Hino Horror Volume 7: The Collection (M Collection)
Hino Horror Volume 8: The Collection 2
Hino Horror Volume 9: Ghost School (Ghost School (HINO Hideshi))
Hino Horror Volume 10: Death's Reflection
Hino Horror Volume 11: Gallery of Horrors (Kyoufu Gallery)
Hino Horror Volume 12: Mystique Mandala of Hell (Kaiki! Jigoku Mandara)
Hino Horror Volume 13: Zipangu Night
Hino Horror Volume 14: Skin and Bone