My magic is too overpowered!!

Story of a reincarnated person who has really op magic. Story summary - He was a normal otaku but he died. Now he got to reincarnate in otherworld but he still lived a normal life. Finally at the age of 18, he awakened his system. His system always showed wierd symbols on his magic stats so he thought that the system is malfunctioned. Later when he got into a magic school sis he realise that it's not his system that is wierd. It's just his magic that is tooooo op!!!!