Megami no Oni 

This is a tale about a deliquent in Hiroshima named Sagawa Yoshi a.k.a. "Giccho." His legend started with his involvement in an annual event called the Demon Festival when he was a kid. The festival is an event where people disguise themselves as demons and roam around the town attacking children. Any kid who can defeat a demon will be recognized as a "man among men." However, only the kid who can defeat any of the 4 strongest demons - Hayabusa, Manba, Hanya and Sakura - will be considered a "true man among men." Will Giccho be able to defeat one of the strongest demons, given that even his greatest rival doesn't stand a chance? (Source: MangaHelpers) Included Oneshot: Chapter 0