Reincarnated as a Overpowered Sorcerer?!

Kuro Kirasaki is a 15-year-old boy walking down on a shortcut street on the way back home, he suddenly came across a murder scene in the back of the parking plot near his apartment, Kuro looked at the dead bodies when suddenly experiencing fear, he dialed the police while didn't notice the one who murdered those bodies is behind him. "Hello t-t-this is Kuro Kirasaki, I've found dead bodies behind the nearest parking lot on----", The murderer stabbed him before he can mention the exact location of the park. What will happen next?