Good art and interesting story, basically a sex trip.
The story seems to be this: Guy takes a vacation to this island and meets this girl. He attempts to talk to her and finds out she knows japanese. She told him that a lot of Japanese people visit this island for trips and that her "Papa-san" taught her most of her japanese. When asked what "Papa-san" means, she tells him that's what she calls people who "use" her body. Apparently most Japanese visitors have lots of money to spend so they spend it by buying her. She asks if he wants to be her "Papa-san" and after some fooling around, he accepts. Then they proceed to fuck all over the place.
The next day, she (Sabi-ne) invites him to her village. She tells him that for the whole day she will let him fuck her however he likes for no money, but in return he has to make a baby with her. Of course it doesn't take much convincing and they just start making babies. Since he is no longer paying her, he feels it's weird for her to refer to him as "Papa-san" and instead has her call him "Master" from now on.
With that, the vacation is over. However, when he returns home he takes her with him. She stays with him, cooks for him, and is ready to fuck him in whatever cosplay outfit he likes, usually bikinis. All in all, a happy ending.