This is a story about two middle school boys of the same age, Tetsu and Yuki, who went to an autumn festival. On the way to the festival at a nearby shrine, Tetsu, wearing a mask for some reason, is in a sulky mood. A Hyottoko mask, a railroad crossing, an unseasonable yukata, and mini-cakes. "A Leisurely 15 Minutes on Foot" to the festival grounds, it's an extraordinary autumn night that closes the distance between two friends.