Nakasete Yaru yo Yankee-kun

Kou and Maki have been best friends since preschool. Fifteen years later, they are both delinquents that somehow end up in fights. Kou is cool, stoic, and always hangs around Maki. A running skit among their friends is that Kou and Maki are an item and that Kou is head over heels for his pink-haired partner. But... does that joke hold any truth in reality?
(Source: Futekiya)