Yoshino's Magic Show Tae announces that all her classmates will need to attend supplementary classes for a month if any student fails the proficiency test. Masamune decides to tutor Kojūrō since he scored extremely low on his midterm exam. After Masamune sees Aki tutoring Yoshino nearby, Masasune and Aki each make a wager between who will score higher. Aki is surprised to learn from Yoshino that Masamune was the only student to get a perfect score on his transfer exam. Masamune receives a phone call from Yoshino, who says that she is unable to help him in the wager. Later on, Chinatsu and Kinue are shocked to see Masamune studying instead of working out. On the day of the proficiency test, Yoshino gives Masamune a black iced coffee from the vending machine while telling him that all his studying does not matter. He starts to have a stomachache at the beginning of the proficiency test, theorizing that Aki ordered Yoshino to lace the drink with laxatives. However, he finds out that Aki was absent from a fever, and his boxed lunch caused the stomachache. Masamune and Aki end up being the only students to attend the supplementary classes. Masamune later meets Aki at the train station for a date. He sees her cosplaying as a magical girl, as she believes this to be the "first date dress code". Masamune and Aki watch a horror movie in the theater with one empty seat between them. When they eat at a restaurant, a young girl asks Aki about her cosplay costume. After Masamune tells Aki that the first date dress code does not exist, Aki changes clothes in a dressing room. Masamune accidentally sees Aki in her undergarments, and she knocks him unconscious. Masamune reminisces about his first encounter with Aki at her mansion when they were children. When Masamune wakes up from Aki's lap at a park bench, she leaves after he apologizes for startling her. Yoshino contacts Masamune, saying that she agreed to help him with the revenge plan in efforts to make Aki humbler.