The Melancholy of Haruhi-chan Suzumiya S01 E24 Back in those days, I was driven by a strong sense of purpose

Feeling a little bored on their own, Ryoko and Kimidori discover a present from Yuki to relieve their boredom, which turns out to be a bomb. In order to save Ryoko, Kimidori carries the bomb outside before it explodes. Yuki returns and everyone is alright, although Kimidori is slightly brown.