In the vast and vibrant world of Japanese pop culture, there exist numerous subcultures and communities that cater to diverse interests and passions. One such phenomenon is the doujin (or doujinshi) culture, which has been thriving for decades. For those unfamiliar with the term, doujin refers to self-published works, often created by fans for fans, which can include manga, novels, artbooks, and more.
This work is a representative example of the "wholesome transition" sub-genre within adult media, where the focus eventually shifts from purely physical encounters to the establishment of a long-term domestic partnership.
The phrase refers to a popular Japanese adult manga (doujinshi) series often titled something like Hiyake Ato no Musume to Fuufu ni (Becoming a Married Couple with the Sun-Tanned Girl).
The "sun-tan" serves as a visual metaphor for a specific moment in time that the protagonist carries with her into her new role as a wife. Domestic Bliss: