Wanna Be Number One? Then You Gotta Beat Me!

Daichi Yamashiro transfers to a school in inner-city Tokyo with one goal in mind: to become the strongest delinquent in town. On his very first day at the new school, he hears about Sora Kaburaki, feared as the strongest fighter around. Daichi challenges Sora to a fight, hoping to defeat him and claim the title of Number One. Little does he know that Sora has a different kind of challenge in mind: one that will make Daichi feel things he's never felt before...!

(Source: Renta!)

Note: Includes one extra chapter.