>>281254208 (OP)It ultimately failed by turning into romcom slop instead of keeping the murder mystery revenge angle alive.
In principle, the mystery doesn't even need a particularly good solution, because it's a vehicle to have Aqua (the audience surrogate) learn more about the entertainment industry and Ai.
It could've been something along the lines of Bakuman for film and idols, but then again, it ended up exactly like Bakuman, so maybe this type of story is cursed.