Okakura Otoha

Otoha and Rin became friends sometime after their first meeting in the local park back in high school. They spend a lot of time together and bond over their shared interest in music. She noticed instantly that Rin had romantic feelings for her, but didn't want to confront them at first, wanting to keep their friendship intact and, after learning about the incident with Chika, worried Rin was merely using her as a rebound. In the end, she still accepted her confession on the condition that Rin could promise her she'd only want her. While both were happy to start dating, their differences in personalities, values, and privacy almost immediately cause some friction, eventually boiling over into two public fallouts. The first was during the second Christmas party when Rin learned that Otoha didn’t tell her parents that their dating, a conflict that was created due to Rin already being confident in her feelings and having grown up with a lesbian couple, giving her the impression that same-sex relationships are completely normal, while Otoha is still coming to terms with her feelings and comes from a more traditional family who aren’t as open to these kind of relationships. The second one was during the second Dorm War when Rin felt that Otoha’s jealousy made her controlling and disrespectful towards her feelings for her other friends, while Otoha felt that Rin is too impulsive to be trusted and too close to her other friends. These conflicts, while both solved on the surface, show glimpses into the underlying insecurities, especially in Otoha's after she cheats on Rin and continues to secretly pine for someone else.

Nodoka is Otoha's roommate. Both of them know each other from their time in Kumon-mi Academy and have a casual friendship, despite the glaring differences in personalities and Nodoka's blunt and perverted behavior. While Otoha admits they aren't super close, they both respect each others abilities as artists and try to assist however they can. Otoha seems to actively want to avoid prying too deep into Nodoka's personal issues, avoiding learning about Nodoka's latest book, and seeming uncomfortable when Futaba confronted her about its lack of subject privacy.

Noriko and Otoha know each other form their time at Kumon-mi Academy and were band members at some point. While they don’t spend a lot of time together, they still have a friendly relationship together and started some jam sessions to revive the old band magic.

Otoha’s voice coach. Both have a very good student-teacher-relationship as Otoha respects and appreciates her while Niki is willing to give her all the support she can offer. Secretly, Otoha holds a massive crush on her, imagining a picturesque life between the two of them that would be free of the expectations both face in their daily lives. The signs of this are initially subtly, but blow-up dramatically in both Niki and Otoha's faces after she cheats on Rin.

Since she’s very close with her girlfriend and roommate, Otoha also spends a good amount of time with Futaba and both seem to have a friendly relationship.