I recommend using machine translation to translate help/index.html contained in the installation folder into English. However, since the UI is in Japanese, it may not be easy to use.
Please let me know if an English language user manual exists for your music composition software. I do not speak Japanese, but find your software very interesting. There is no manual that I could find in English on your website. Please let me know if you can provide information on how to use this software in the English. Thanks.