https://www.dlsite.com/maniax/work/=/product_id/RJ386228.htmlThis is a game where a serious girl is taken to a nearby nudist beach to study different cultures. There's no sex, it apparently focuses on embarrassment and watching the serious girl open up to a nudist lifestyle.
Apparently, if the Japanese version does well, the author plans on translating it into English, but I don't know the criteria for what the author considers "successful".
https://twitter.com/tomotomo_Japan/status/1527695754596597760 