Yamada-kun and the Seven Witches

It's summer break, and the students are enjoying themselves in the hot springs and the ocean. They're also taking the make-up test, which they're supposed to take the next day. The students are worried that they won't be able to pass the test, because they haven't studied hard enough. They also worry that they'll run into witches, who will try to trick them with their powers. They decide to try another experiment, this time using the same powers.