Kaochisa

Kaochisa is the femslash ship between Kaoru Seta and Chisato Shirasagi from the BanG Dream! fandom.

Canon
Kaoru Seta and Chisato Shirasagi are childhood friends of each other through their parents being friends, they go on to grow up as good friends and join their bands respectfully with Kaoru being the guitarist of Hello, Happy World! and Chisato Shirasagi being the bassist to the girl idol band, Pastel*Palettes. Kaoru is a third year at Haneoka Girls' Academy, while Chisato is a third year at Hanasakigawa Girls' Academy. They follow the childhood friends to lovers trope.

In the two's area conversations, Chisato is shown to be easily annoyed towards Kaorus advances and prince-like persona, stating that she knows "The real Kaoru." Kaoru does not seem to mind this, and the two continue to be friends.

In "A Roses Name in a Transient World", Kaoru invites Chisato to play Juliet in her schools play of 'Romeo and Juliet' for the Cultural Festival, where Kaoru would be playing Romeo. Chisato accepts the invite, and continues to audition and get the role as Juliet. As she enters, Kaoru comes in and refers to Chisato as her "Juliet", and continues to refer to her as Juliet throughout the event. After the two do the reading of the script together, Chisato goes up to Maya and compliments how well Kaorus acting is. In the later chapters, Chisato tells Kaoru about their past, and mentions their childhood nicknames for each other. Where Chisato would call Kaoru "Kao-chan" and Kaoru would call Chisato "Chii-chan". The mention of her old nickname had flustered Kaoru, and she asks Chisato to stop. Chisato continues to call Kaoru that her being flustered is cute. After another reading of the script, Chisato goes back to Maya to talk to her about Kaoru, mentioning that they might be more simple when alone together. In Chisatos card story for the event, Kaoru is confused on why Chisato has had some change of heart, in which she replies "When I'm with you, I can be a version of Chisato Shirasagi who is not a performer or entertainer."

Theres also an event where it looks in on Chisatos and Kaorus childhood together, but it has yet to be translated and added to the english version to the game.

Fanon
The fandom seems to have a mixed response to this ship, some fandom members claim that Chisatos actions towards Kaoru are "toxic" and that ship in general is toxic. Other members of the fandom appear to think otherwise, that the ship is healthy and that the two have a healthy dynamic.