On cue, teachers and students drop to the ground and wait for further instructions.
"This is a drill," a voice echoes over a loudspeaker across this small coastal town.
"A missile has been launched."
Moments later, the entire school body runs from the athletic field into the school gym. They are joined by elderly volunteers, who line up in rows next to the children seated quietly on the wooden floor.
This is Japan's first evacuation exercise preparing for the scenario of a North Korean missile attack against this country.