Ayane Amamiya

Ami and Ayane have known each other for years, and they often compete against each other for User's attention. This usually ends with them bickering and teasing each other, but they never stay mad at each other for long. Over the years, they've developed a mutually supportive relationship, with Ayane even being somewhat supportive of Ami's taboo feelings. Despite the number of unexpected developments over the course of the year, such as the class doubling in size, the two remain close, even forming the "User Love Squad" in retaliation to the larger number of girls in his life.

Despite knowing each other for years, there aren't many times when Ayane and Maya hang out together, usually only doing so when Ami tags along. While not on bad terms, the two were nothing more than casual friends until they have an important talk. Afterwards, Ayane grows increasingly suspicious of the relationship between User and Maya. In the end, though, she still sees her as a good friend, going as far as to ask Maya to protect Ami and User in the event something happens to her.

Sana is Ayane's roommate. As a result, the two are extremely close, confiding in each other about topics they wouldn't share with anyone else. This compatibility surprises most viewing from the outside, due to the striking differences in their personalities. The two became friends after they met during a 'dark time' in Sana's life, and have been inseparable since.

Ayane has known Kirin for years but never significantly interacted with her until the events of the school year. Even then, Kirin happened to have caught bot Ayane and User having sex and used it to blackmail the two, leaving herself and Ayane as outright enemies. Ayane holds a deep grudge and distrust towards Kirin for what she did, but remains powerless to stop her.

Ayane's family situation is complicated. While she loves her mother deeply, the two haven't seen each other for some time, due to her parents separating when she was young. And, after their divorce, her mother seems to have made no attempts to contact Ayane. Regardless, Ayane still holds her in high regard, aspiring to be just as good a mother as she was.

While never close to him due to his constant work, after falling into her father's custody, she builds a growing resentment towards him. She goes as far as to declare him her "arch nemesis" and a "super villain" in Slumber Party. The situation between them seems even more complicated, as Ayane herself hesitates on going into specifics.

Being the Amamiya family's butler, Ayane and Geoffrey spend a large amount of time together. According to her, he's "the only one in the house who pays attention" to her and is often mentioned as delivering food or various other things to her.

A karate dojo owned by Osako, who also works there as it's instructor. Ayane started practicing there on a whim and had only been going there for a few days when User first visited. Much to Osako's annoyance, Ayane uses her time there to mess around with User. This includes playing some kind of war game with him, bringing fire weapons or other out of place objects to support their plays, like a massive fan, or just loafing around. Despite that, Osako mentions that Ayane is actually pretty good when she decides to participate.

The home of the Amamiya family. It's the second largest mansion in Kumon-Mi, only topped by the Tsukioka estate. While it's full scope is unknown, it has a few location that are known, like the dojo with a few side rooms, a backyard with koi ponds and a lot of restrooms in a labyrinth-like structure. The Amamiya Estate hosts some of the Halloween parties and, therefore, is visited during the Halloween Parties.