You are, Kyosuke Mita. You have never had date with a girl in your whole life.
Not only you have never dated before, the girl you ask out dumps you. You're depressed about this incident. Out of nowhere, Aunt Asako Shimura comes to visit you. She is a photographer who travels all the time. You have always looked up to her. Noticing that you are depressed, she asks you to be her assistant and invites you to a tropical island. You go to Hasune Island with her. Your aunt brings along the energetic Mizuki Kasuga, her sister, Yuki, and a girl with a nice body, who is a year older than you, Takami Hibiya. It is up to you to decide if you want Asako or a harem with the three girls. Please fulfill your exotic desires on a tropical island this summer!!

[From Gamelexgs]