Crypto tax in Japan

This is my first crypto tax ever and I’m a expat living in Japan.

I really don’t know where to start from, I’ve subscribed koinly and uploaded my transactions into the software but I didn’t get many things clear.

My questions are:

When do I have to send the documentation? (I started it invest this year)
Who to send it to?
There also may tax report to download which is the most suitable one for me? I’m just a little holder

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