As a Result of Japanese People Being Summoned to Another World Too Much...

Japanese people are disappearing without warning, vanishing in an instant. Some vanish in groups, some are hit by trucks, and others suddenly disappear from their shut-in rooms. There are no clues. Where on earth have they gone? Then one day, a boy discovers that the missing persons are in another world. And today, a student at a certain high school is summoned to another world.