A Villain For Fun is a fan fiction/fanon story which is based one ONE's webcomic, anime, and manga adaptations of the One-Punch Man universe. As a largely reimagined universe which takes place in an alternate timeline and earth, A Villain For Fun tells the story of the protagonist known simple as Nagoya, a young male adult who inexplicably developed unimaginable power and the ability to crush any foe or obstacle in his path with no effort at all. A Villain For Fun is a highly alternate universe with no mentions of any canon characters, though the basis of the story and many elements from the original OPM are still present in the story.