The control panel of the Crystal Signal Pi was Japanese only. That will change with an update of our middleware - which we will push to the Github repository in the next few days. You can also find the English software manual here:

https://github.com/infiniteloop-inc/crystal-signal/blob/MultiLanguageSupport/doc/README_ENGLISH.md

We hope that we can start distributing the Crystal Signal Pi sometimes around next month in the USA! Ever thought about using your pi as a notifier device? We supply the HAT for that!