I always love to see interactive narrative experiences like this; somewhere between a game and short story. I'll be honest, my knowledge of Japanese culture is lacking so I'm sure there was a lot that I missed, and some stuff I struggled to follow, but not so much that I couldn't enjoy the story. The protagonist made me laugh a number of times and I enjoyed the story overall.
If I had any feedback, it would be to perhaps shorten the intro a bit and get to the detective stuff faster so long as that doesn't mess up the pacing too much. The gray text was also a little on the hard side to read, but I managed!
Thanks for the experience!