Chapter 15:
Just One Win!!

Yusuke and Botan witness Suekichi Matsuo being beaten up by some guys. Yusuke reveals that Suekichi Matsuo, also known as "Matsu the Dud", was a bully magnet he used to save (for a fee). When Matsuo gets knocked out, Yusuke takes over his body and beats up his attackers. Koenma appears, and tells Botan that it has been decided to let Yusuke have his body back. He finds out what's going on with Matsuo, and decides to observe Yusuke's actions for now. Yusuke goes back to Matsuo's home, and finds a poster with the words "just one win" on it, which is Matsuo's goal. He gives Matsuo control of his body back, and they go to school the next day. There, Matsuo is confronted by Tachikawa, another kid who aims to represent their school in a boxing tournament. Tachikawa forces Matsuo to fight him, and beats him up. Matsuo refuses to give up, so Tachikawa decides to use non-boxing techniques, knocking him out. Yusuke takes control of Matsuo again, and defeats Tachikawa with one punch.

Chapter 16:
Finding the Guts for Glory!!

Yusuke watches Matsuo train, and believes he has a punch that could knock out anyone with. He then watches him in a sparring match, only to find he closes his eyes whenever his opponent throws out a punch. Yusuke believes that Matsuo lacks guts, and takes control of his body again. He bumps into someone and screams at them when they try to start something. The guy goes off to his friend, Samejima, and gets him to confront Matsuo. It turns out that Samejima is going to be Matsuo's opponent in the upcoming boxing match, so Yusuke taunts him and says he'll rearrange his face in the ring. The day of the match arrives, but Matsuo wants out -he believes his opponent will murder him. Yusuke tries to convince him otherwise, but Matsuo wants to quit without trying. Yusuke gets fed up of him for not wanting to try, and tells him to get out there and do it. This concinves Matsuo to give it his all, forcing Yusuke out of his body. He fights Samejima in the ring, and despite Samejima trying to use dirty tactics, Matsuo is able to defeat his opponent.