As the class president left to have you wait, and choose a club, you notice that you were being watched, and find who appeared to be a girl with long purple hair, and D-Cup breasts, who was wearing a black hoodie. You couldn't see the rest of the girl, who only showed the head, torso, and arms of herself, and she didn't say anything.
When you go over to her booth, she was still silent, but she did write a note on the table, and give it to you. You pick up the note, and read it, once you were given the note. "If you want to join our student club, please come to the gym after school, and go alone," the note explains, but just after you put it down, you find that the black hooded woman was gone. You have no idea why that girl wanted you to join her club, or why there was no sign at the booth explaining which club she's in, but you needed answers.