The way I'm hoping it goes is that she keeps zoning out and not paying attention, mistakes here and there and bam. She gets told off by the director, but gets comforted by fuccboi. But she then wants an alone time, and checks her phone. She notices some posts about a movie, and it was the one Shinobu directed and it starts to become a hit. She hesitates and looks into her contacts and see his name, and the amount of times he called her before. She feels partial regret about not hearing him out, but she knows she cannot just go back and talk to him, so she continues to work but keeps on failing, until even fuccboi starts to get seriously concerned about her.
At a point, she went out to get some fresh air but stumbled upon Shinobu, with Fumi, but not just them, with his friends all around him supporting him and cheering together, whilst she is there behind them alone. As Shinobu turns every now and then to talk with everyone, he noticed Sakura, he stopped but stares at her. He was about to say something, but he knows it's too late so he didn't.
Instead, it's Sakura that reaches out, but everyone else noticed too. She wanted to talk things out, but Shinobu (as I want him to), addresses her as Katsuragi-san and says there is nothing to talk about. He gave her what she wanted so that is that. He continues walking forward with the rest of his friends who seemed concerned but follows him. Except for Fumi who stopped to talk to Sakura.
She drops the bombshell truth to her. Shinobu never cheated on her. Sakura never left his mind and he never had any thought of cheating on someone that he truly loves. Fumi apologises as she feels she is partly to blame for the misunderstanding but the truth is now out. She told Sakura that Shinobu and her now walk different paths and she must understand that he is no longer in her life. Fumi then says that she will do her best to make Shinobu happy, because she knows how bad Shinobu's situation is after the breakup. She says goodbye, and Sakura stood still, frozen, stares blankly down, as tears slowly drip down from her face...
And guess what, it's another fever dream of mine.