Description

A lefty, a righty, a liver shot, and the left hand punches the face.
And a left hook, a right body punch, then a right straight.
Another one from the right, blocking the left side of the body, quickly regain stance on the left, press on with the right.
There's one coming on the left side, cross both your hands, and then quickly follow with a left uppercut to decide the match... But then...

Our protagonist, Yukimura Yukinojou, who just completed his transfer to Kashima school, unexpectedly helped his brand new classmate, Kasuga Serina, from the assault of delinquents on her way home. The school festival is just around the corner, the hectic atmosphere is present everywhere, thus Serina and her friends enlist him to help too.
Thankfully, all the effort Serina put into it paid off, brought everyone together in such a short time, and the school festival went by with success. But, just when he was about to think that such a daily life isn't so bad, a girl from his past appeared before him, and before soon started to reveal the reasons he moved away and transferred schools.
Not displaying any emotion openly, Yukinojou has his heart sealed that he blames himself for all those events, and gets driven to the wall. As a matter of fact, a grave accident in the middle of box practice made his best friend lose his consciousness and enter into coma, which resulted in Yukinojou leaving everything behind as he was unable to bear this.
His heart tormented with such sins, would anyone be able to rescue him?