I actually want a physical ETF for bitcoin, but it may be a while before it can be traded in Japan, so...
For now, I'll think of it as a long-term investment and buy bitcoin on Mercari!
Before, when I received 300 yen for free from Mercari for bitcoin, I didn't really understand it and sold it immediately, but now I can buy it without any worries.
This is also a learning experience!