During his third year, Yonezaki was considered a lone wolf, however was often seen rolling with Zetton or Gunji. Being a very low key individual, Yonezaki was respected for his keen intellect by Suzuran as well as rival school delinquents alike, despite not being among the strongest of his peers, the fact that he was formerly the head of Ida Mid likely meant he was among the smartest of his fellow senior leaders, this led many to fear his ability of planning attacks, with even the likes of King Joe making it a priority to eliminate him before going to all out war with Suzuran.
After graduating, he left to work in a bar in Roppongi and, much to the dismay of his friends, had a girlfriend 2 years younger than him.
Freshmen WarEditYonezaki is first mentioned in Crows when he enters Suzuran from Ida middle school and beats fellow freshmen Kakimoto from Five middle school. Yonezaki has already got a following and in the shadows, Masa and Hideyoshi discuss how Yonezaki is in their class and how he will be the first to kneel to them. In their class, Hideyoshi tells Yonezaki that room B is either his or belongs to himself. One Yonezaki's followers gets up and angrily tells Hideyoshi to repeat what he says. Masa gets in and knocks down Yonezaki's follower and beats him on the ground untill Hideyoshi tells him to stop. Yonezaki and Hideyoshi then engage in a fight and Hideyoshi beats Yonezaki by knocking him through the class window.
When Yonezaki returns to school, he is met be Udo, who tells him that he needs to talk to him. Yonezaki tells Udo that if he thinks he can collect the 6 buttons, then he should just quit as there is no way he could beat Hideyoshi. Udo tells him that he isn't planning to fight Hideyoshi, but he will get the 6 buttons. Yonezaki starts to feel uncomfortable. Yonezaki sees that Udo, Morita from class A, Takeuchi from class D and Tajima from class E are planning to gang up Hideyoshi, Gunji and Zetton to become the rulers of the first. Udo tells Yonezaki that he wouldn't take lying down with one of those three as the strongest of the freshmen. Udo says to Yonezaki that he wont be shit for the next three years. An angry Yonezaki pushes off Udo and tells him he wont play his stupid games and to next time think about who he is talking to. Udo and Takeuchi tell Yonezaki that he will have to watch his back and that he will regret his desicion. Yonezaki turns to them and says that he might be bad, but he isn't rotten.
From a distance, Yonezaki sees Gunji get jumped by Udo and his group. Yonezaki turns around and walks away, thinking to himself that it doesn't concern him. While walking away, Yonezaki bumps into Hideyoshi and Masa. Hideyoshi tells Yonezaki that he better not skip PE as they are playing soccer. Masa said he is his teams goalie and needs him against this asshole (pointing to Hideyoshi). Yonezaki then tells them the Gunji was jumped by Udo and he is using a group to jump the three of them. A shocked Hideyoshi jumps off the stairs and is told that they are behind the gym. After Hideyoshi runs after ambush, Masa asks why did Yonezaki help, to which Yonezaki says he has no reason, to which Masa smiles.
After the weekend, Yonezaki walks around Suzuran looking for Gunji. Finding Gunji, Yonezaki offers him a cigarette and asks him who won between Hideyoshi and Zetton as they faught on saturday and that they are absent from school today. Gunji tells him that Zetton acquired all 6 buttons, much to the shock of Yonezaki who was surprised Hideyoshi lost. Yonezaki said that with Zetton being Bouya's lackey, no one will challenge the senior leader at the rooftop, to which Gunji says the show's not over yet, which Gunji implies that Zetton will challenge Bouya. Two days later, Yonezaki bumps into Masa who is shouting after Hideyoshi who walked away not interested to see Bouya and Zetton fight. Yonezaki says to let him be as he has a lot of pride, and that he must be frustrated he didn't reach the top.