Rin Rokuhara (Stranger)

Molly is Rin's friend and a fellow employee at the Koi Cafe, usually being slotted into the night shifts. Unbeknownst to Rin, Molly has an enormous crush on her and pays extra attention to her after accidentally discovering evidence of her self-harm. Rin remains oblivious to this, even after they share a kiss on Christmas. Her blindness to this fact causes a large amount of tension between the two, especially once Rin begins displaying obvious signs of her crush on Otoha. This culminates into a fight between the two which caused Rin to put their friendship on hold and to keep her distance from her for a time, currently their friendship is slowly starting to recover, the two slowly return to friends.

Sana is one of Rin's old high school classmates. Despite sharing a mutual interest in video games, the two didn't speak at all until their teacher had forced Sana into forming a friendship with her. They don't hang out as much as Rin does with Futaba or Sana with Ayane, but Sana considers Rin her second friend.

A diner that only serves a giant portion of spaghetti and sausages known as a "sausage party".

Otoha is Rin's first girlfriend. They share a mutual interest in music which sparked an initial friendship between them. Ever since meeting her, Rin's had a crush on Otoha and has obsessed over how to impress her extensively, causing Rin to be extremely jittery and awkward whenever they speak in person. After her confession, Rin manages to calm down, but still shows signs of exaggerated anxiety concerning the future of their relationship. During the second Dorm Wars, the two begin to fight, causing future tension between the two that wasn't resolved which caused them to break up. Otoha is currently being taught how to be a better singer by the famous idol "Niki Nakayama". Niki sees Otoha as a possible protégé.

Futaba is Rin's best friend and the two have known each other since Elementary School. She's the only one who knows about Rin's cycles of depression and is often the one to look after her when they break out. In return, Rin is very attentive to Futaba's troubles, usually noticing changes or issues before anyone else. Their relationship remained strong throughout the years, looking out for each other while also struggling with their own problems.

Rin has had a crush on Chika dating back to their time together in middle school. Despite how approachable and friendly Chika is, Rin struggles to even begin a conversation with her, causing Chika to worry that she might be coming off as unfriendly. Eventually, Rin works up to courage to confess to her, but, knowing that she will be rejected, made an escape before Chika had the chance to answer. As a result of her broken heart, she slipped into another depressive episode, but recovered shortly after when Chika confronted her and properly rejected her feelings. Both promised to remain friends despite this hiccup. While they aren't seen hanging out frequently, Chika extended her advice after Rin and Otoha begun to fight.

Rin is Rika's adoptive daughter, and the two have been family for so long that Rin often finds herself forgetting they're not biologically related. Despite this, the two have a good relationship, often playfully picking on each other whenever they're together.

Due to Nodoka being roommates with Otoha, Nodoka and Rin were often seen together, though it’s unclear if Rin considers Nodoka as a friend or if she only spent time with her due to Nodoka living with Otoha.

The Koi Cafe is owned by Haruka Hamasaki. There is no real information about how successful the business is, but considering that there are no stories about failure and the place seeing its fair share of customers, it can be assumed that it's doing well. Both Rin and Molly are working as baristas, though they have completely different work schedules. The cafe becomes a place User frequently visits to get his regular dose of caffeine, though most of his experiences are drinking one of Rin's weird concoctions.

Haruka is Rin's employer. The two are very friendly with each other, teasing and bantering in between the breaks and swarms of customers. They're in a group chat together with Molly where the three share updates on each other's lives, as well as schedule their shifts.

Niki Nakayama is a well-known and successful Idol and pop-singer in Kumon-mi. Niki is currently the vocal coach of Otoha. Rin idolizes Niki and sees her as being above everyone else in the idol industry.