Chifuyu Matsuno/Relationships

Keisuke Baji
Chifuyu first met Baji when he was a 12 year old delinquent who had conquered the entire school, even the upperclassmen. He didn't think much of Baji, as he had just flunked last year and was held back. In addition, he was dressed like a nerd but was horrible academically. Chifuyu helped Baji with a letter he was writing, causing Baji to grin in gratitude.

Later that day, Chifuyu is ambushed by a biker gang, Mandala, because he had assaulted one of their underlings. He is surrounded and horribly outnumbered, but Baji appears and singlehandedly wipes all of them out. Chifuyu is amazed, and Baji becomes the first person he truly respects, prompting him to join Toman afterwards. Their close relationship is marked by their tradition of splitting a Peyoung Yakisoba.

After becoming Baji's right-hand man, Chifuyu continues to loyally support and place his complete trust in him. When Baji planned to join Valhalla as a ruse, Chifuyu willingly accepted to be brutally beaten up in order for Baji to be trusted by the gang's executives.

When Baji is about to die, Chifuyu holds him and is the last person he talks to. Baji reminisces about their origins by musing about splitting a Peyoung Yakisoba. Chifuyu shakily echoes the sentiment. When Baji dies, Chifuyu screams in anguish. Later, Chifuyu upholds this final request by splitting a yakisoba by Baji's grave with tears flowing down his face.

Takemichi Hanagaki
He often acts as an advisor to Takemichi, helping him create plans before taking action, giving him advice or being his emotional support. Chifuyu was the first person from the past that Takemichi revealed to him that he came from the future, making clear his great confidence in him. Takemichi and Chifuyu would eventually become best friends, with an unmatched trust between the two. Chifuyu often calls Takemichi "partner".

Ryusei Satou
Ryusei thinks that Chifuyu is a cute guy. Despite the times Ryusei has insulted and fought with Chifuyu, he sees Chifuyu as a worthy member of the First Division of Toman. He even interceded for Chifuyu when the members of the First Division were upset with him. Though indirectly, Ryusei said that Chifuyu is very interesting, the opposite of him, an idiot.

Chifuyu sees Ryusei as an obstacle and rival for the position of the Vice-Captain of the First Division of Toman. Chifuyu also thinks that he is a very scary guy due to his fighting prowess and excellent deception skills. Ryusei greatly annoys Chifuyu because of his playful personality. Ryusei once pranked Chifuyu into getting a ridiculously large and hilarious pompadour and another time tricked Chifuyu into overeating noodles. Ryusei does not see Chifuyu as a threat and does not consider him a rival. Since it is Chifuyu's goal to defeat Ryusei in some way, the moment he gets to know that dogs are his weakness, Chifuyu doesn't hesitate to use it against him.

Chifuyu and Ryusei seem to compete about even the most trivial things, with Chifuyu taking the competitions seriously and Ryusei seeing them as a fun pass time. For example, they once competed for Peke J's affection.

Despite their rivalry, Ryusei once saved Chifuyu from getting beaten by a delinquent and Chifuyu acknowledged that Ryusei is not such a bad guy since Peke J likes him.