A girl from another school becomes interested in the Tenmon club, although Kyoko is oddly hostile towards her. It is soon revealed she is Kyoko's younger sister, Izumiko, who was close with Kyoko before she ended up divulging in her delusions. Kyoko and Izumiko soon engage in a quiz battle, which is interrupted by the student council president, Yuka Iseda, forcing them to settle their score in another fashion.