Reborn, Started Cheating in the Second Grade of Elementary School

The boss who was about to become the richest man was killed by his opponent with an RPG. Then he was reborn with a plug-in system and became a second-year elementary school student. In school, I am just a good pupil. But in the outside world, I can control thunder and lightning at will! Classmate, are you showing off your wealth to me? Sorry, I can make your father spread your ass with just one word. And you, are you trying to learn from me? Even if you are a god of learning, I am already studying advanced math. Why don't you use your cute IQ to give me a cup? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.