High school student Yuki suffers from a chronic disease and has lost hope for living. One day she has a life-changing encounter with Aki, her destructive classmate with a beautiful singing voice. Together they decide to form a band with Yusuke who secretly has feelings for Yuki.
A record company office worker named Kanna discovers a punk rock band called Shonen Meriken Sakku (Brass Knuckle Boys) through the internet and subsequently decides to represent them on behalf of her company. What Kanna did not know was that the Brass Knuckle Boys consists of all middle aged men.
