S1, E4: The training course for the special preparatory class reaches a turning point. Naomi joins the class as the fifth student in Sakuragi's class. Yusuke, Hideki, Yoshino, and Maki are woken up at 5:00 a.m. to study, but they start to drag their feet. Sakuragi leaves the class with Ino, and goes to see a legendary math teacher. In what appears to be a dilapidated Edo-period schoolhouse, Sakuragi begs Tetsunosuke Yanagi, the University of Tokyo mathematics demon, to teach math in his class. Yanagi accepts but makes the student with the lowest test score wear a headband with moron written on it. When Yoshino fails a test and receives the headband, she runs off in tears. Ino and Yusuke find her with her gang friends, and Ino is embroiled in a game of chicken in exchange for Yoshino.