izigame.me

The most confounding crime here is why the game is so unknown.
But seriously, the game has a lot going for it. I love the animated look, the characters are surprisingly expressive during conversations. Menus are easy to read and mostly smooth to navigate, which is important when you'll spend so much time there poring over evidence.
The story is good so far. It's rare to get a straight up detective story like this that also has proper detecting gameplay; usually its one or the other. History and geography play a factor too, it is a genuine period piece that uses the setting and I'm sure the developers' own knowledge and experience to give an earnestness to it all.
Others have noted the issues. The English translation can sometimes be awkward, though not enough to impact the story or your deductions (that I've seen). Most of the difficulty so far has not been from failing to understand the mystery, but not knowing how to register that knowledge with the game to fully explore all the leads. Finding just the right lines to compare can be time consuming, though it does at least feel like detective work and putting things together is rewarding. It can sometimes just feel arbitrary when one connection is fruitless and another yields progress.
Still, the investigation mechanics themselves are good. I like how open the connections and hypothesis systems are, it lets deductions feel more like your own and less guided. The confrontations where you use your evidence to corner a suspect are a fun gamification of the classic detective speech.
Overall I think this is worth a try for anyone interested in detective games, so long as you accept some jank and frustration are a part of the process. There is a hint system now, and you're allowed to make mistakes, so don't let the reviews about difficulty put you off.
Will update if my opinion significantly changes as I get further.