A group of high school students (3 boys and 3 girls) decide to go on a lost island, called Daikokujima ("big black island") as a club event of the "Exploration Club". One of the islanders disappears and the new goal of the club is to get his whereabouts. Well it's still mostly the game about the girls whose number is about 10. Game is quite difficult to clear, mostly because of lack of save slots and saving system that takes you to the beginning of the event.
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