In a secluded corner of the coast, a hidden world of mythical beings thrived under the ocean's surface. Sirens, mermaids, and other sea-dwelling creatures lived in harmony with humans long ago. However, a devastating war changed everything, and the memory of these creatures faded into legend.

Ren, coming from a wealthy family and having used his family's wealth to secure a spot at college, found himself among his new friends, preparing for a celebratory overnight gathering on the beach. Alcohol flowed, spirits were high, and one by one, they passed out, strewn about the sand. As the sun rose the next morning, the group began to awaken, their hangovers serving as a rude reminder of the previous night's excesses. However, as they slowly took in their surroundings, they realized something was amiss – the beach was completely deserted, save for their little group.

And then they discovered the true horror of their situation – their only escape route was blocked by massive rocks towering over the water's edge, trapping them on the deserted beach. Panic slowly rose among the students as they took in the gravity of their predicament. They were stranded on the beach, with no idea how or why, and no apparent means of escape. The vastness and beauty of the ocean stretched before them, mocking their predicament. The group of students huddled together, trying to make sense of the situation and figure out their next move.