Finished playing Kansai and Yousei by Sakevisuals.
For Kansai, I'd have to say that it was pretty old or unpolished because even though it seemed to feature an interesting case, the culprit was so dead obvious that I didn't realize it in the first place. I kept expecting the plot to twist but it just... didn't.
Also, interactions with sub characters (those other than Li Mei, officer and the twins) are minimal, if not disconnected. There just wasn't enough lines to make you feel anything for them - although in real life it'll probably be the same case more or less - to give them life, and one of the reasons it didn't pop into my head who was the culprit because, well, they just weren't described enough.
I might even think that the first game, however simple it was, might have done better.
There was also the problem with the full screen option where every time you alt+tab out to check something and go back in, you lose control over some functions (like the skip button). Tap enter once after that and it'll revert to window mode (as if you had 'Alt' held), and you have to go into the options and set it back to full screen for things to work properly again. If you're wondering why I'm going through so much trouble that's because the graphics looks best in full screen. In window mode they just looked... weird or something.
By far the worst offense of the game was that there was neither the usual skip button on the text box interface, nor the choice to clear off the text box itself. This was basic setup even on the default Ren'py interface but for some reason they've decided to remove it, and it sucked hard. It was purely coincidence that I discovered the 'Tab' button was for auto skip, and before that I had to hold Ctrl all the way to the end. How annoying. The text box itself was also too dark and cover one third of the screen, so when you're trying to examine things it sometimes really felt like you're missing interactable objects.
However. Despite the flaws stated above, Kansai has managed to produce some pretty amazing characters. The twins, inspector Gurski and Li Mei are such wonderful people that even though the play time was short (I literally finished both games in just under five, or even four hours) they just shone brightly. The story may be bad, but Kangai and his new buddies' interaction made the entire experience shine. You'll have to play it yourself to see it.
Also, things get infinitely better in Yousei, the latest sequel to the series. Almost everything was about ten times more polished than it was before, and for once someone came up with a good textbox interface that didn't feel like it needed tweaking. You have about five small buttons (if I remember correctly) that allows you to select all of the basic functions of a Visual Novel, and an almost transparent text box which was crucial in an mystery themed game like this. And then the sprites were changed and improved into a much higher quality one, which was a delicious treat especially on a cute girl like Li Mei.
This time you get to interact a lot more with the characters, and deeper too with Kangai's new family. Really, the best trait of the entire series were its main characters (like good god, I love ALL of them, and I don't remember the last time I don't at least hate one). Li Mei was as usual adorable as hell and yet deadly to the bone; Aki was super cool and witty and god DAMN I love her antics; Naoki's cowardliness was given a good enough explanation that he now actually looked cool, and finally Miko is just THE cop anyone would like to befriend. Although it's best to avoid them altogether, generally speaking ^_^.
Oh, and did I mention about the voice acting? There's a clear improvement between Kansai and Yousei, and Yousei is seriously THE game to buy for if only just for the voices. They truly made the characters alive, and god DAMN again Aki and her voice actor were a match in heavens. Sakevisual must've been astronomically lucky to find the perfect match so quickly (since Kansai).
However, again, despite such a great cast of characters - and really, they're one of the best I've seen and hell, I'VE FINISHED BOTH GAMES IN LESS THAN FIVE HOURS! - the plot is just subpar. Once again the audience were treated to a delicious and far bloodier murder which investigation, ironically, was about as dull as mowing the lawn. I can tell you that it all boils down to click, talk, talk, click, talk a lot more. What's funny is that you would gather a tonne of information during the investigation, but only a couple among them are actually key to the case. I guess it's realistic, but it can also be borin.
Also, the Examine part of the game is still pretty much dead useless. With the exception of ONE - and JUST ONE - examination that's absolutely critical to progress the game (I had to check the walkthrough to pass that point because it's existence was completely random, unlike in Kansei where the object was actually pretty intuitive, and even on full screen most people wouldn't even notice that object), the others simply yield pointless observations. They need to enhance this part and actually make the exploration part relevant, rather than leaving it all up to conversations. I also dislike the fact that they didn't 'light' up an interactable object so it'll be easier to navigate and realize (like how Dangan Ronpa did).
The other thing that I feel truly annoyed about the series was that THERE WAS NO WAY TO CONFIRM WHICH ENDING YOU'VE GOTTEN. I, by pure luck and coincidence, managed to get the true end on my first try, but even now I'm still having doubts whether what I got was really the true end since there's no actual indicator at all inside the game. I actually have to check their walkthrough and compare ending scenarios to match which to which, and honestly this is just bullshit. I should not need to do this.
All in all, while Jisei, Kansei and Yousei may NOT be worth their price (I bought it on 50% discount so it's okay, but their full price felt a tad bit too high) if you measure by its length, the incredible cast of characters and excellent voice acting were worth the value. Buy it at your own discretion.