It's important to note that this game isn't really translated. One can pretend that the automatic MTL that is reliant on having an internet connection counts as translation, but it really doesn't. The MTL translation doesn't help you understand much. And the UI isn't translated at all. So if that puts you off (it should), this game is to be avoided by the plague. At the same time, the gameplay is fairly intuitive; certainly it takes a few runs of trial and error to get the hang of things but once you do, the gameplay loop was satisfying enough for me to warrant the high rating.
Stories in H-Games are irrelevant. They set the stage for naughty shenanigans and there is some story going on the background for this game, but since the gameplay doesn't really rely on it, I could safely ignore it and not have it affect my enjoyment too much. There is a problem that since this is somewhat of a VN, where your choices affect the outcomes and the endings significantly, not knowing what is going on can be a major dampener. It is very easy to get locked into one sort of ending and that takes away from one's enjoyment. Another major watchout.
Nonetheless, once you get over all of these failings (by no means failings of the game itself), you realise that what you have is actually quite entertaining. You are in control of a number of characters aboard a train and you have to position them strategically in order to chikan the shit out of whatever heroine you choose. And there are a fair number of them. Your nefarious actions are affected by people in proximity to you, the shaking of the train itself and whether the heroine can escape. There are three types of movement types for your main character to choose from and a number of skills that make your life easier. Cornering someone strategically wasn't hard and it was immensely rewarding.
The H-Scenes themselves are a delight. I enjoyed the animated undressing aspect of it. It satisfies a particular kink in me. The 3 main heroines have a number of static scenes as well, all along the same lines. The quality here is particularly high.
In short, if you can see beyond having no translation, having to figure out the game by yourself and having no clue as to what direction to take the story lest you get locked into certain endings, the game can satisfy a particular itch and satisfy it immensely well. I'll be on the lookout for more games from this particular circle.