An incompetent but proactive Fate realizes that she made a mistake, giving protagonist #1 an unbearably and undeservedly shitty life. At the same time, a desperate King calls out across the Cosmos for a Hero to save his Kingdom from the Demon Lord, latching onto protagonist #2. A neglectful but efficiency-minded Reaper sends Truck-kun to snag them both at the same time in the same crosswalk. Somewhere between Earth and their destinations, they get switched.