Download rikaikun chrome extension. rikaikun shows the reading and English definition of Japanese words when you hover over Japanese text in the browser. and install in your Google chrome browser. This is Direct rikaikun Crx download for Chrome it is also called rikaikun offline CRX for chrome Download. This rikaikun is used to rikaikun shows the reading and English definition of Japanese words when you hover over Japanese text in the browser.