What happened?
It's almost certain that the police in Australia won't do any investigation about a Chinese scammer operating in Japan. In my country, the UK, the police often won't even turn up at your house after a burglary these days.
However you do need to make sure you get a police report about suspected identity theft. This will help you in the future if somebody tries to make a credit card or something similar in your name, which after reading this thread is what I suspect will happen.
A quick Google around led me to:
Identity theft - Moneysmart.gov.au
I think you seriously need to do what it says on this site because I can't imagine any other reason somebody would spend the amazing amount of time that you said they did spend chatting with you if it wasn't to scam your identity to make a credit card or something similar.
Let us know how it goes.
Upon visiting the police station here in my city and pleading my story the officer on duty at the front counter; he listened but offered nothing beyond repeatedly suggesting that I contact ACORN (Australia Cybrecrime Online Reporting Network) which is a relitively new initiative put forth by the Australian Government as a means of centralising information collected on cyber crimes and as a tool used to solve them (ideally). Reporting to ACORN is done by writing an online report. Nothing as of yet has happened as a result. I informed my bank and based on what I told they cancelled my cards and we changed my passwords.
I really want to move on but I would be lying if I said that I don't still think about her all the time. Wonko mentioned in private chat that I should find a nice girl and he also mentioned in a seperate message that my intensity in the relationship was unhealthy and that it would be worthwhile if I show some restraint, and it's true that I'm not very good at modulating my desire.
I have taken upon Tinder as someone suggested to me. I've been on the app for 14 days and have accrued 50 matches across those days which is better than my housemates have over a way longer period of time in a low population city (my comparison test). It seems as though some people find me attractive; I felt unattractive after Ran because she would tell me how attractive she thought I was all the time, and everything she said was a lie.
I was enthralled by the prospects that Tinder had attuned me to, I cultivated conversations with many of my matches, nothing untoward, and setup three dates as a result. The second of which soon evolved into a "Netflix & Chill" like scenario. I researched her identity on the Internet to find out how real she was, and everything she claimed of herself was affirmed on her Facebook profile with co-authenticating evidence to boot.
I think that my thirst for affection overcame me, tempered by my feelings of loneliness. I showed up formally dressed while she was just waking up, still in her pyjamas (at the time we had agreed upon btw). I Brought my own ingredients and cooked salmon with grilled asparagus and a side of roast pumpkin and couscous salad topped with ground cashews and lemongrass. I was way more endearing than I should have been. Knowing myself as having a penchant for intensity in relationships I promised to myself that I wouldn't act with such strong emotional signalling. But almost everything I said was doused in romance. I really couldn't help myself.
I stayed in her company for 5 days as we lost track of time... and as I lost interest...
Although I could touch her skin and kiss her lips (and did very often) I didn't begin to care for her in a fractional amount compared to how much I loved Ran.
She jokingly called me her fiancé in a message recently (she doesn't know how creepy I find that now).
I've visited her again after that. I was going to call it quits but I then I relised that it won't be the same as it was with "Ran" (because she's a real girl) and that I shouldn't attach the same expectations to this relationship, and just play it out as it happens.