Jiro Yamada/Relationships

Ichiro Yamada
Jiro greatly loves and respects his older brother, Ichiro, basically treating him as a god. Jiro always follows Ichiro (almost blindly), whether it comes to interests or being a delinquent. He never doubts his brother, and Ichiro sometimes reprimands him, saying that Jiro shouldn't follow him blindly.

However, when they were little, Jiro used to hate Ichiro for his way of life, saying that he would never follow him.

Saburo Yamada
Despite being closer in the past, Jiro usually fights with Saburo at every occasion (usually when it comes to Ichiro's attention). Although Jiro is always irritated by Saburo mocking him, he still loves him as his little brother and is always ready to protect him, as an older brother.

Jyuto Iruma
Jiro and Jyuto developed a mutual hatred prior to the Division Rap Battle. Although Jiro hated MAD TRIGGER CREW beforehand, just for being their enemies, he took it personally when Jyuto insulted Saburo, picking on his anxiety before the battle. It also angers him when Jyuto treats both of them as nothing but children.

Rio Mason Busujima
While Jiro was arguing with Jyuto before the Division Rap Battle, Rio told Jyuto not to tease children too much, which provoked Jiro even more. He insulted Rio, calling him a cosplayer of a soldier and challenged both Jyuto and Rio to a fight.

Doppo Kannonzaka
During the incident at the Yokohama container yard, Jiro assumed that Doppo was working with people who kidnapped Kaede Bojo. He told Doppo that he's disgusted by his actions, although he gave him credit for being the Division Rap Battle champion, and attacked Doppo. When Tobari brothers revealed themselves and neutralized all four teams, Jiro teamed up with Doppo to buy time for others and fight Tobari and their men.

Rei Amayado
Jiro never knew his father, as Ichiro told him and Saburo that he died when they were little. While Ichiro was searching for Nemu at Osaka, Rei visited Jiro and Saburo, revealing that he is their father, and said that Ichiro lied to them. Jiro refused to believe Rei, being angered that Rei dared to call Ichiro a liar.

Nemu Aohitsugi
In the past, Jiro met Nemu when he and Saburo were abducted by Mozuku Shito and his peers, Jiro admired Nemu for her bravery when Mozuku threatened to harm them without fear. After that incident, Nemu offers an invite for the Yamada brothers to have a dinner together including her brother, Samatoki.

Urumi Asogi
Urumi is Jiro's acquaintance in Shinjuku who gives him information from criminal underworld. Despite Urumi usually toying with Jiro, she is genuinely concerned about his well-being.