Kaorui

Kaorui is the femslash ship between Kaoru Seta and Rui Yashio from the BanG Dream! fandom.

Canon
Rui and Kaoru are both high schoolers; Rui is a first-year student at Tsukinomori Girls' Academy, while Kaoru is a third-year student at Haneoka Girls' Academy. Rui is a member of the band Morfonica as a violinist, while Kaoru plays the guitar for the band Hello, Happy World! While Rui is very stoic and blunt, Kaoru is very open about her emotions and has an extravagant personality.

Their first and only major interaction so far has been in the event "Luminary Sakura Symphony", where Morfonica members are invited by the 5 original bands to have a hanami party. In Chapter 4, Rui is shown talking to Kanon and Hagumi, though she initially muttered that she wants to talk to Roselia's Yukina (which she finally manages to do in her 3★ card story). Kaoru steps in and Hagumi briefs her on what's happening, and says she'll do everything she can to help Rui. Rui then proceeds to ask about the technical side of their practices, with Hagumi answering that they're always smiling whether performing or training. Rui tries declining that wasn't what she wanted to hear, but Kaoru corrects Hagumi by saying they also need a certain sense of fleetingness while performing, which just ends up confusing and even possibly annoying Rui a bit. The scene ends there, as it was seen from Mashiro's POV and she walks away.

Fanon
Kaorui is hugely a rarepair, and it is mostly seen as a crackship. This is due to their very limited interactions with each other as well as the fact that Kaoru already has a handful of other big or less popular ships.

Fandom
FAN FICTION

Trivia

 * Rui and Kaoru have a 1 cm height gap (Kaoru is 170 cm, while Rui is 169 cm tall).
 * Both characters have handsome androgynous appearance and their promotion is directed towards the female audience of the franchise more than the male audience.
 * Fans joked about the pros of their possible interaction, including interesting rivalry or shipping, even before Rui's group, Morfonica, appeared in the game. Including Ran's VA Ayaneru, who joked that she was attracted to Rui's handsome beauty and that it would easily make her a worthy rival for Kaoru in terms of popularity among the female audience of the game.