Sango Tsukumi

She came to the island together with her friend Konami during the summer vacations to work for cold hard cash. A cheerful girl, she looks at everything positively and is a mood maker. Because everyone around her is older, she planned to use honorifics but failed massively. She has a very straightforward personality and can speak to the protagonist normally, she also lovingly refer to Umi as "Umi-oneechan". She is very good friends with Konami and is always worried about her, but at the same time she works really hard.