Ogawa to Yukai na Saitoutachi

Ogawa is a total pushover. So much that she's been voted the "most apologetic" and "most bossed around" girl in the school! So what happens when she gets dared to kick the "Three Feared Saitou" - the infamous boys who have bad reputations - behind the knees? They end up teaming up with her of course! The Saitous decide to protect pathetic Ogawa from being bullied–hilarity ensues!

Wikipedia