I would use this drawing tool seriously, but it's all in Japanese…

Artistic expression is not limited by language! However, the tools used to compose these expressions may be. What program are you using?

I'm using Pics Limited.

It seems you didn't download the English version of the program. You can find the original post for the English version here: https://miiverse.nintendo.net/posts/AYIHAAAEAACHVRTxgvVlaA The key is <C33KEP3F>. The English version updates the UI. Just be aware that the help menu for the program is still in Japanese. However, it is wholly unnecessary to fully experience the program.

I had no idea that there was an English version, thanks!