One way for international fans to support this drama is to buy the manga legally, there are some ways to do it:

1. Buy the official English version on Amazon: https://www.amazon.com

It's been licensed and published by Square Enix Manga and currently available up to Vol 2. Vol 3 will be available in March 2021. Both paperback and Kindle version are available.

2. Excerpt of the manga chapters in Pivix Comics (raw): https://comic.pixiv.net/works/5100

There are excerpts of the chapters but not complete version and currently up to Chapter 25.

3. Buy the Japanese manga on Amazon Japan: www.amazon.co.jp

For those who understand Japanese or want to buy the raw version, manga can be bought on Amazon Japan. It is available on paperback and Kindle version. It is possible to buy from outside Japan, you just need Amazon Japan account and a little bit of modification to get around the country restriction (many tutorials available on internet). 

Thanks for the link! :) I just purchased volume 1