Andeh put on the main page of the VN here on Itch that he used some stuff from the guys that are remastering/rewriting Morenatsu (at the images and sound credits), so Idk if it's a tribute or some kind of "partnership" (We don't know if Tora will be a date, but hopefully yes XD)
So yep, we can say that it's in Morenatsu universe at least XD