That was hard. And my guesses were all wrong.
I swear I’m not detective material.
Some Rubbish Infomation
Company = Innocent Grey
Scenario = 鈴鹿美弥 (Kara no shoujo writer)
Artist = 杉菜水姫 (Catagara, Pianissmo, Kara no Shoujo)
Genre = Closed circle mystery murder suspense gore
What’s so special = Dark and mysterious theme throughout the eroge, famous innocent grey gore, absolutely mind blowing art, a frustrating detective system, for once there’s a good ending, closed circle mystery