The tropical islands of Southern Japan: a blissful paradise that is a far cry from the hustle and bustle of life in the big city. For Kei Igaya, spending a school term in the tropics as part of a student exchange program is one thing — but to spend it with a whole family of sex-crazed maniacs is another. Join twin sisters Akari and Tsuzumi, together with their mother Tamaki, as they show Kei their own version of “Southern hospitality”. In this installment, Akari makes the first move on Kei after finding him a lot more “interesting” compared to other people on the island. Be it on campus or in the bedroom right after school, Akari just can’t keep her hands off of Kei.
Kei and Akari have gotten into a regular routine of sex, but when she has to go away for the weekend for an overnight field trip she worries he might be lonely without her. She shouldn't worry, though, since the usually quiet Tsuzumi has every intention to keep him busy for the weekend in her sister's place. What will happen when Akari gets back and learns of the two growing closer while she's away?!
Kei is getting along with Akari and Tuzumi together with no problems, having lots of great sex, but another thing the sisters share is their period. As expected, that means no sex for a week. They take it on themselves to decide for Kei that he also won't be getting off, but at the same time they just keep on teasing him right to the edge. When it seems like he can't take any more, Kei learns that Mrs. Nakanogou knew about the complicated relationship all along and not only is she ok with it, she offers to help him out while her daughters aren't able to!
After holding back for a week, Akari and Tsuzumi reward Kei with a swim at the beach, where they of course have more then just swimming planned. Once they get back from a day full of threesomes and creampies, Kei helps their mother, Tamaki, move some boxes... as well as control her libido. While continuing to have sex with each other behind Akari and Tsuzumi's back, Kei learns more of the past of the family, and what happened to the father. Will Kei be able to hide his secret relationship with their mother from Akari and Tsuzumi?
Kei and the sisters are studying together, but something's different, and Akari is growing suspicious. Akari does what she does best to try and wring out just what happened the other day, and Kei is awful at telling lies! Will he be able to hide what happened between him and their Mother? Tsuzumi on the other hand doesn't care, she just wants to have sex with the man she loves, and takes this opportunity to tell him exactly how she really feels.