A dejected woman finds an unconscious man resembling her former dog and takes him in as a "pet", forming an unexpected bond as they overcome obstacles together, raising the question of whether such love can exist.

At Aitoku High School, repeat sophomores Kōji Katō and Tōru Nakama are bruiser fighters who scorn any flashy titles. They pursue honor student Kyōko Izumi alongside their loyal crew. When rival gang leader Teru’s “bontan-gari” attacks sweep through the district, even Aitoku’s toughest, including Kintarō and Junpei, fall prey, until Kōji and Tōru themselves are targeted and Kyōko is kidnapped by Teru…

As children, the introverted Smile was being bullied by a gang of kids until the brash Peco comes by and chases all of them them away. Peco then takes Smile under his wings and teaches him how to play the game of ping pong. From there a life long best friend relationship comes into existence between these two polar opposite kids.