Mito is always cool and collected but not above playing pranks and basically acting like a twelve year old. He seems fond of Hanamichi, happy that his friend has found a place where he can focus on.
He is also supportive and you can rely on whenever there's a fight. There is the time when Mitsui wreckes the basketball gym, he and his friends allow themselves to be blamed from what Mitsui and Tetsuo's gang had done.
Mito is first seen playing pranks with Sakuragi when he asked and got rejected by the 50th girl. With their other friends Noma, Takamiya and Ookusa, they celebrate Sakuragi's failure. But then they ended up getting beaten by Sakuragi.
Mito is the one who deals with the seniors when Sakuragi was asked to meet them up in the rooftop and that time, Sakuragi is in a bad mood for having another failure on getting a girl. But the time they went to the rooftop, Rukawa handled all of them which causes him to be more curious about him and thought of him as no ordinary guy. At the same time, Haruko saw them and thought Sakuragi is fighting Rukawa and the reason for having him injury. When she left and Sakuragi was hated by his crush again, Mito and the others celebrated again for his failure. But then, Mito talks to Haruko that it is a misunderstanding.
During the match between Akagi and Sakuragi, Mito and his friends is seen betting who will be the winner.
When Sakuragi joins the team, Mito and his friends have been watching him during the practice. Most of the time, they kept on pestering him when he is on the basics.
Sakuragi spends most of his time in the basketball team so his friends thought of their days as boring and then they saw Miyagi being rejected like Hanamichi and they play pranks on him like what they keep on doing Sakuragi. But he doesn't like it at all and look bad at them. Mito is the one who calms him and apologize for their behavior.
When Mitsui made a ruckus in the gym to destroy the basketball team, Mito who decides to leaves early encounters Mitsui's group and other guys from different school. He fought the seniors after he was asked to come with them. He and the others Noma, Takamiya and Ookusa played part at the gym where they face Mitsui's group for saving the basketball members from disbanding. Mitsui receives a lot of punches from Mito. He and his friends admitted the ruckus in the gym by reasoning that they don't want Mitsui to leave their group who wants to come back in the basketball team which caused them to be suspended for three days.
Entering the Kanagawa Tournament, Mito and the others are always seen watching the games of Shohoku had even in the practice game against Ryonan.