Osawa Konami (Ozawa Kazuhiro) and Mitsui Nagito (Tokui Yoshimi), who are about to turn 50 and admire the way of life of "Beach Boys". They run a cafe called "Café Diamond Head," which looks just like the "Diamond Head Inn" where "Beach Boys" was set, and the two men share their love lives and secret pasts with the people who visit. This is the story of how the two discover their own ocean through various experiences. The world of "Beach Boys" is depicted throughout, including famous scenes, lines, and props from "Beach Boys", as well as the friendship between the two main characters, so this is another highlight of the series.