The only issue I can think of is that in the world of super long light novel adaptation titles, you might run into character limits with the longer title that a different tag would have.
While this is a good point, I don’t think cutting down 6 characters would be of much help.
It’s a pretty fun whodunnit.
There’s one aspect - that’s critical to the whole story - that annoys me though, enough for me to consider dropping it.