A girl who was raised with care in a wealthy family. - However, her life at home is very strict and her days are suffocating with cram school and lessons. - There was only one place for these girls to feel at ease. - The shack of a dirty-looking but kind old man I met at the park. - It was called a secret base among the girls. - But one day, an old man suddenly gets excited about the defenseless girl and bares his fangs!