Writing as of 1.0, might matter in the long run.
As a chikan lover it saddens me to give it only mediocre score, but despite amazingly smooth and vibrant art and very very nice animations, the game kinda lacks everything i actually value in a chikan game. Will elaborate a little below.
First of all, there is simply no tension or consequences, like yes, you can raise her vigilance level and the ride ends earlier but otherwise you don't "strip" her for example, you just press a button and she just rides in lingerie instead like nothing happened, SHE doesn't even react on that fact. Train state doesn't matter as well, you can freely go ham in a "Crowded" state and hang her with the ropes from the ceiling and no one cares, including her.
I'm not sure if it will be the case in later versions, but as of now game is pretty poorly balanced and kinda broken. When you buy top 3 upgrades your funds sometimes return or even increase so you can semi indefinitey do this to cheat the system, which can lead you to an awkward situation where you just put it in and she cums immediately, pretty much removing animations from the game. Game is also silent as a grave, so it cannot support fantastic visuals with audio stimulation.
But most importantly, as i said, there is nothing here that makes a chikan game exciting. It's the feeling of powerlessness of the victim who chooses to stay silent and tolerate until she gets "corrupted" by this, it's the excitement of not being found and doing it in plain sight, it's this sort of intimate secret between two people in a crowd. None of it is here, this game essentially wears a chikan skin without being one.
I can't really bring myself to put it lower than 3 because of geniunely smooth and colourfully pleasant visuals and art, but it's just not a good game of this genre.