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[Suspenseful adventure, mainly plot, no CP, no emotional drama] A group of fifteen or sixteen-year-old high school students met for a trip, but encountered a car accident on the road. After that, strange things have been following them... The underwater tomb buried for thousands of years has no owner and grave objects. Instead, it has been occupied by various strange creatures. What unknown secrets does it contain? Where is the owner of the tomb? Who is driving all this behind the scenes?