Can someone tells me what is the title of the background of the place holder?

after some research, they’re OC (original characters)! the authors name is junjun_penguin on twitter/X, they posted this on the 09.08.24 if you’re interested to check them out :)
(this is a copy-and-paste answer i answered a few times a while back, so don’t be surprised if you see this again somewhere else hahah)