I hope the remake can fix some of this stuff but Goto is just hardwired into the story sadly, so there's no getting around that. The mystery is just impossible for the in-universe characters to solve so they had to add in a super genius for them to even have a chance at winning
Finally done with Shigatsu Youka after more than a year. The core of the story is good but there are two major issues that really brought it down for me after the first arc (aside from general amateur writer stuff that's expected) (1/3)
2. Goto is great in slice of life scenes, but when the mystery stuff is happening she turns into an obnoxious mary sue character that can do anything and completely ruins the mystery for both the characters and the audience