The invasion of Snake demons put the human world in a very vulnerable position. At that moment, there emerged an epochal genius. "No, please don't help me up! I mean it. My learning efficiency can reach the highest only when I'm lying on my back! This is my special learning habit. I swear I'm not sleeping", said the genius. Laziness is human nature. But if everyone can transform their laziness into something useful, it may enable us to survive in every dangerous situation and urge us to make progress generation after generation...