Karasuno HighEdit

Kōshi SugawaraEdit

Daichi has a close relationship with Sugawara, having been friends since their first years. They know each other very well and rely on each another as teammates and friends as they've been through the ups and downs of their team together. Along with Asahi, they often hang out together outside of the team. Sugawara also seems to be the only member of Karasuno who can lecture Daichi and occasionally be immune to his intimidation.

Asahi AzumaneEdit

Daichi has a close relationship with Karasuno's ace spiker and enjoys teasing him. Along with Sugawara, they've been through the ups and downs of their team together since joining together in their first year. They often hang out with one another outside of team activities. Daichi believes in Asahi's abilities and commitment, even trusting him to return to the team despite Asahi's reluctant attitude at that time. Because of this and Daichi's general reassuring disposition, Asahi respects Daichi as a teammate and captain.

Kiyoko ShimizuEdit

Daichi is close to Kiyoko as he was the one who recruited her into Karasuno in their first year. They occasionally talk to each other outside of team activities. Daichi also finds her attractive.

Karasuno HighEdit

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Ryūnosuke Tanaka and Yū Nishinoya: Daichi believes in the two second years' incredible skills, but is often exasperated by their wild behavior and lack of responsibility.

First Years: Daichi initially threw out Kageyama and Hinata because of their antagonistic relationship, but this was later revealed to be part of a plan to get the two to collaborate to form an incredible attack pair for Karasuno. He believes in the two's abilities and cares a lot for them, but often has to break up their arguments. Daichi cares about Tsukishima as well, but didn't know how to help him overcome his lack of passion towards volleyball. In the end, he's glad that Tsukishima was able to work it out himself.

Other SchoolsEdit

Hayato IkejiriEdit

Daichi went to the same junior high as Ikejiri and they were on the volleyball team together. Ikejiri was inspired by Daichi back then because of his unwavering determination in winning a match despite the huge probability of their team losing. Even now, nearly three years since they last saw each other, Ikejiri still remembers Daichi's quote, "We'll never win if we don't believe we can." They apparently lost contact after graduating junior high, but after their teams went up against each other in the Interhigh, they've become close again and see each other more often. After Interhigh, Ikejiri is shown to support Daichi by giving encouragements to him and cheering on Karasuno in its matches.

Tetsurō KurooEdit

Daichi and Kuroo share a mutual respect for each other as they are both team captains and many times look out for
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their teammates and underclassmen. Most of their interactions take place during the training camps where their teams play against one another. It was during one of these camps that Kuroo approached Daichi to apologize for upsetting Tsukishima. Kuroo occasionally teases Daichi for the Karasuno team doing the most penalties during the camps and Daichi later hints to Oikawa that he and his team became stronger thanks to help from Kuroo and Bokuto. Both also share the goal to have their teams face one another at Nationals.
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