Also: I think they evolved from the 1830s in Europe ( also I would suppose, perhaps wrongly, Japanese families back then didn't visit the coast to enjoy paddling in the low tide ).
Could someone kindly supply me with some recommendations for Luigi doujins please? I have the above dounjin as well as this one but I haven't come across many more after those. Not had a lot of free time to go searching sadly.
Also hoping there are doujins of white school swimsuit Yuu and bikini Rou. I already a nice collection of normal Rou-chan doujins, she always looks so lovely in her swimsuit.
That reminds me, I had been meaning to check if I was up to date with Fujisaki Hikari's Shioi and Rou doujins.