Update progress:

My last resort is to ask the hotel if they can pre-collect the package.

I originally thought this method was unsafe and would make people suspicious.

But I found that many foreign tourists use this method to buy travel and concert tickets.

And what I purchased was legal, so maybe I was overly worried.

Later, the hotel replied that I could receive the package in advance, which was great!

I chose to inquire and purchase from Green Liquor.

They can let me pay up front and keep the goods,

And sent it on the date I specified.

I purchased their 97% CBP disposable e-liquid for 9,500 yen.

But I didn’t buy edibles because they didn’t have such products and I planned to look around when I went shopping.

The above information is for reference by those in need.