@TokyoJoeblow
We all get a bit drunk and/or horny, but try to avoid being too creepy or too desperately pushy/overly aggressive, as it usually won't work out in your favor.
1) Be a GENTLEMAN at train stations.
Do NOT let yourself be put in the creep or "chikan" category.
You can "escalate" verbally or flirt using facial expressions, but avoid getting too touchy right away. Try to be SMOOTH in your actions. Be very aware that Japanese women can PRETEND they are fine with an overly pushy guy at the moment, then later complain about you and get you in trouble.
Japanese guys are also famous for pulling the "drunk sexual harasser" routine. It's where they get drunk, and then say extremely rude shit to sexy looking women. Like they will pay her 20,000 right now if she goes to a hotel with him. Many Japanese women can be extremely paranoid or defensive about this, so can assume you are approaching them from this angle. The more aggressive they perceive or imagine you to be, the less favorable they think of you or the more likely she's to panic.
2) If She Appears Truly Sexually Receptive
Ask her to come with you to a nearby, and OUTSIDE the train station area place, like a restaurant or park to talk. That is more a green light that sex can happen. Then you can be a bit more "test touch" and feely.
If she tells you that she must go home or has no time, that means better to exchange contacts and try to meet her ANOTHER day. If she was not Japanese style FAKING or a bullshitter, then she will meet you on some agreed upon day. If she meets you, often that means she is physically or sexually attracted to you.
3) If She Comes With You To A Place Outside The Train Station
At the restaurant, park, etc... Touch test her, but NOT in an overly clumsy and too direct way, like touching her breast. Rather put your arm around her, and see how that goes. Then after talking a bit, with arm over the shoulder, kiss her neck. Make some excuse, like "you smell so good/ really like your smell/you smell like a flower".
If she is calm about a neck or cheek kiss, then go for lip kissing after a bit more talk. If she's up for kissing, then you know sex can be possible, and think of where to take her. Also she might live nearby and will let you even come to her place, if she has a natural trust and rapport with you. Some women very much fantasize about and want outdoor sex or sex with a stranger, which is often not publicly admitted, BUT be very CLEAR from her actions and reactions that she is receptive and adventurous.
4) Do NOT Get Excited About Japanese Women Giving You Their E-mail or Contact Info
Japanese women can hand out their LINE or e-mail like free candy. In fact, some Japanese women use it as a sneaky way for guys to give up. They FAKE as if they like you or are receptive, then NEVER reply again or stop responding after 1 day.
It's very hard to tell really receptive Japanese women from those that are FAKERS. A key is her enthusiasm and response to talk about you meeting her again. If she starts talking about she's busy, when you talk about meeting again, she's likely a faker or bullshitter. Another way is fakers and bullshitter females tend more to be "cool" and have blank/emotionless facial expressions, versus authentic smiling and their face showing true enthusiasm. It takes time, but after awhile a foreigner/guy can become better at reading the facial expressions AND tone of voice.
Anyway, if she responds and agrees to meet another day, then you should be enthusiastic and not just over e-mail or a LINE contact.
