Shot in Miyakojima, Okinawa, “RENA18” also includes pictures from when she was 15 and featured in the magazine “girls!”, tracing her history until the present day. Sato mentions how she helped produce the book in suggesting certain things she wanted to show, in order to place the reader in her “Sato Rena World”. She added that she wanted to show in one book how she had grown up since that time, even if she felt that she had not changed much in the year between 17 and 18.