Konomi decides to pretend to be a monster to tease Renge, who seems to show a talent for multiplication. The next day, Renge decides to try riding her bike without training wheels, with minimal supervision from Kaede. As Renge ends up with a fever the day afterwards, Kaede comes over to help look after her. After Renge recovers, Kaede decides to take the day off work to teach Renge how to ride her bike.