You can change the language from your browser's language settings.
[For Chrome]
・Open "Settings" of Chrome and select "Language" from "Advanced Settings".
・From the "Language" pull-down menu, switch the order of "Japanese" or "English".
・If the language with the highest priority is Japanese, Japanese will be displayed as the text on the site; if the language is other than Japanese, English will be displayed as the text on the site.
[For Safari]
・Go to "System Preferences" and select "Language and Region".
・Switch the order of "Japanese" or "English" in "Preferred Language".
・When Safari is restarted, Japanese will be displayed as text on the site if the language with the highest priority is Japanese, and English will be displayed as text on the site if the language is other than Japanese.