A programmer sharing an apartment encounters an eccentric roommate with a three-second precognitive ability, an ability whose duration is too short to seem useful at all. At first, the programmer merely considers the other person a liar, but gradually changes their view after successfully avoiding danger several times. Starting from mutual disdain, the two skillfully use three-second pre-judgments to handle everyday trivia. Later, the roommate uses their supernatural ability to stop an out-of-control bus, saving all passengers on board, and low-profile declines interviews after becoming an internet sensation. Accompanied and working together for a year, the programmer lets go of prejudice, recognizing this seemingly noisy yet kind-hearted roommate.