On the end of summer break holiday, the club decided to go to summer festival because Kodaka, Sena, Kobato, and Maria wanted to eat takoyaki. After hauled many fireworks from the festival (thanks to Yozora and Sena antics), they played it but the last firework they lit accidentally burnt the tip of Yozora's hair. Week later, on first day after summer break, Yozora came to school with that new hair style.
Kodaka shocked, not because Yozora cut her hair too short while the fire only burnt just the tip of her hair, but because on that moment he realized, with the short hair, Yozora was actually Sora, the only best friend Kodaka had 10 years ago, the one whom he thought was boy.