it IS very Japanese heavy so hopefully it gets an English setting or a patch, BUT, if you screenshot the page and open the screenshot in Google Lens you can use that to translate! While it's by no means a perfect translation and is a tedious process, it gets the job done in a pinch! 
English
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Elektra Kosh Edwards
4.8This app is a perfect companion app for the Vital Bracelet. The new update has now put everything in English so now you can understand whats going on! Thank you Bandai!
Edmund Caesar
5.0the only thing is that heavy japanese text. hopefully they will add on english subtitle later.