Need Help With Translation

The card was identified as Kaapai Beach in Tonga. Can anyone identify the language printed on the card and/or translate the front and back for me? It may be Japanese because the back of the card says Tokyo on it. I tried Google Translate and was not successful.

I believe the text on the back is 'Post Card' in Japanese.

The text on the front means "Island of Shells"

Thanks. That's a lot of help. It is unfortunate that it doesn't identify the island. I can't think of any other way to do that.

Lifuka Island.

Any ideas how I can confirm that it is lifuka. I want to use the postcard in a presentation at my local stamp and postcard club.

Hmm…

https://www.ebay.co.uk/itm/135560427820

The vendor understandably misread the postcard caption as Kaapai- the 'K' is a capital H.

Ha'apai is a group of islands; there doesn't appear to be a particular island of that name. Lifuka is the largest island, and has the administrative capital, Pangai.

So that's my best guess

There appears to have been a small number of Japanese living in Tonga in the 1930s, including married couples and men married to Tongans. On the outbreak of hostilities the Japanese were removed to New Zealand with the intention of sending them to Australia prior to a planned exchange of civilians with Japan. This didn't take place- antipathy towards the Japanese led to this group's postwar return to Japan.