The Melancholy of Haruhi Suzumiya Part Six Episode 14

Haruhi becomes frustrated and jealous of Mikuru's friendly relationship with Kyon. One night, Haruhi's power is activated without her knowing. Haruhi and Kyon become trapped in a sealed reality at their school. Before long, a blue giant appears and begins to destroy the school and the surrounding area. As more appear, Kyon and Haruhi evacuate the school. Kyon uses hints, provided by Yuki and Mikuru beforehand, to defuse the situation and escape