One day, the students of UA Academy, Class 1-A, decided to go to an island for summer vacation. They were given a house and they settled there. One evening, when everyone was having fun in the house, Katsuki was sitting on the beach by the water, watching the sun change to the moon and the sea become calm, there were rocks and cliffs all around, when suddenly he saw someone peeking out from behind a cliff and hiding from his sight. He screamed

“I saw you! Get out already!”

But no one came out, and when he climbed one of the cliffs, he saw you, a girl with the upper part of a human and the lower part of a shark