devilman is a Manga/Manhwa/Manhua in english language, Action 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 world where Heroes and Villains coexist. The main character, Kim Aru, is a high schooler who is hiding his ability because of his trauma. He is a victim of bullying at school because of his obedient personality. But when his precious ones are in danger, he always transforms into a ‘Devil Man’ in order to protect them.