Yukarisu

A high school girl who works at Mitsuha's family restaurant. She is in a relationship with Mitsuha, the manager. However, her true identity is that of a female fighter whose mission is to monitor and execute anyone who notices the presence of Shocker. When Mitsuha and her friends notice the presence of Shocker, she attacks Toujima and his friends in an attempt to kill them all in one fell swoop.