I'm curious how the visual novel format would work beyond the 1 study session. In any case this would make a great study app, I think especially if ported to mobile.
Regarding the investigation sequence, it's a bit of an annoyance to be repeatedly asked if I want to leave when there's quite a few more places I want to check on.
However, I love the character designs, art, and cute character sfx. Looking forward to the full version!