Kaori showed up at the wrong address at the wrong time. She thinks she is being interviewed at Kodan Productions which is an idol agency, but she is actually at Rock You which is an AV production company. The woman who works at Rock You thinks Kaori is there for an interview. It's a misunderstanding. Rock You is where Saori who was introduced in chapter 73 works. I believe this chapter is just to put Kaori in touch with Saori since Kaori has no reason to start doing AV.