Not exactly a bad game, but not good either, Starts off fun but after discovering that the game got insane grind going on, I got way too bored after unlocking the 3rd ending.
It's just a mindless gameplay of: grope her, pause when alert level is high, switch up when she about to reach blue heart (negative effect), rinse and repeat. It's boring and very repetitive.
They're also very lacking in features as well. For example, it's difficult to remove her panties without removing the skirt first since you need to click on the specific area/pixel without any indication at all. You also cannot re-dress her again, nor can you wipe off cum from her body, etc. These are just personal pet peeves though.
Not going to write a full guide since I gave up on finishing this, but hopefully this can answer some common questions.
I'm not 100% positive, but it seems like to progress the game eg: unlock events, tools (tounge,dick), and endings; You'll need to unlock the achievements which is where the grind hell begins where you need to raise every single of her zones with your hands, tounge, and dick.
There's seems to be only 6 sex scenes; standard standing Vaginal (Front), (Back), and standing Anal (Back).
There's also HJ, Paizuri, and BJ. With them sharing the same climax animation other than BJ if you come inside her mouth.
There's also events where you can peek on her underwear while in escalator, filling the bar during that event will unlock her underwear for future molestation, which unfortunately I'm not sure on how to trigger it as it seems to be random, since if you fail and reload your save from previous day, the events sometimes doesn't show up again for the next day. Also, there's like 13 (excluding the default) different underwear to unlock. So not only I don't know on how to trigger it, you also needs to "win" at the minigame 13 times. No thanks.
During morning molestation, if she's facing towards you and you make her cum 3(?) times, she will enter "deep cum" state where she falls on the floor and you can finally do BJ,HJ, and Paizuri scenes.
But if she facing away from you, I think you can trigger the events where she will run away, and you can chase her to "rape" her inside toilet or elevator, and by "rape" I mean it's just the exact same gameplay and animation like during train molestation, only without prying eyes, and with extra CG after your rape conquest.
If you want to play "legit", I recommend saving for the invisible app since you can no longer get caught anymore after using it. Else just hack the game. Fortunately it's easily "hackable" just hook CE and use the default 4byte and you'll find the value for money.