One day, the human race is temporarily stunned. Those who are not stunned are fine, but those who have awakened cannot see, hear, or speak. States are paralyzed, governments are lost, and civilizations begin to decline. After a month, those who have passed out and have lost their senses are called 'numbness', and the intact people begin to be called 'sensors'. In a world that treats insensitive people as zombies and gradually loses their humanity, can they survive to the end in a world of insensitivity...?