What Doki doesn't want is continuing to be dragged into this war against Niji when in reality she just wants to move on from the whole shitshow

Being a Doki fan and being anti-Niji are NOT mutually exclusive. Sisters must understand that people can be both a Doki fan and a Niji anti. This whole "Niji black company" title is not only spawned because of Selen. That title had already existed as soon as they killed Zaion, and they kept doing that to other graduated members until the Selen one was the last straw that broke the camel's back