The following photos source lparchive and the danganronpa wiki
kirisaba is the ship between kyoko kirgiri and mukuro ikusaba. hopefully you already know what danganronpa is, but even then, you're probably not familiar with the interactions between them. let me give you a summary about their interactions to be concise:
mukuro ikusaba helps her sister junko enoshima trap their classmates into a ace attorney style battle royale death game, wiping the memories of their peers. she immediately gets killed by her sister. kirigiri is the first one to discover ikusaba's identity as the "ultimate despair", resulting in a rather over-used meme.
kirigiri does an autopsy on her. Naegi, the protag, says he feels sad about leaving her body lying in the morgue. Kirigiri does NOT feel bad for ikusaba.
Well, that's all folks. Thanks for reading. hopefully i've convinced you of why kirisaba is peak.
Okay that's not all. danganronpa is a franchise, meaning they have non-canon interactions too.
Ultra Talent Development Plan is an alternate universe set before the death games. ikusaba and kirigiri are friends! only ikusaba isn't really herself. she's pretending to be her sister. oh did i forget to mention that ikusaba switches identities with her sister.
note Ikusaba's interest in kirigiri's detective work this will be relevant later on.
cute right? aknowledging each other's talents...interesting. i'm going to link a video for this next udtp interaction because i think it's more sentimental with the ost.
cute right? ikusaba is empathetic towards kirigiri's hard work and considers her schedule for the christmas party. kirigiri treats ikusaba as if she's enoshima, but she's not particular about exposing other's identities if it's not related to a case.