Buyuden

Buyuden (Japanese for , "A Heroic Story") is a Japanese sports manga series written and illustrated by Takuya Mitsuda. It was serialized in Shogakukan's "Weekly Shōnen Sunday", from March 2011 to January 2014. Its chapters were collected in thirteen "tankōbon" volumes.
Plot.
Isamu Take is an elitist 6th grader who looks down at his peers because he is the best at everything he does at school, from looks and smarts, to his luck with girls and his abilities as an athlete. He considers himself to be in the top percent of his age group and is incredibly bored with interacting with the so called normal people. A new student, Moka Kaname, transfers into his school and as she is fairly pretty, Isamu asks her out.
Moka mishears what he says and thinks he wants to challenge her, as she grew up boxing. In fact, Moka is an amazing fighter and can even take down 5 middle school boys at once. Although Isamu can’t stand her violent personality and she can’t stand him for having so much pride, they start to grow attracted to each other. But then Isamu finds out that not only is Moka more athletic than him from all her years of boxing, she's also much smarter than him.
Manga.
"Buyuden" is written and illustrated by "Major" and "Major 2nd" author Takuya Mitsuda. The series ran in Shogakukan's "Weekly Shōnen Sunday" from March 16, 2011 to January 29, 2014. The series was collected into thirteen "tankōbon" volumes released from July 15, 2011 to June 30, 2014.