Soutarou just manages to pay his school fees by doing part-time jobs. After helping his kouhai Umi and skipping his shift, he was fired from his part-time job and was having problems making ends meet. Umi felt responsible for his present situation and introduced him to a part-time job at a Southern resort. With deep blue skies, clear seas and vibrant vegetation, the place looked exactly like in the travel magazines.

Moreover, he was surrounded by many girls: energetic imouto-like Sango, affectionate airheaded ojousama Riho, shy and earnest Shiori, and the kind but also strict manager Nagisa. Arriving at the resort, Umi turned to him and asked him to spend the time there as her boyfriend.