Dexzus the Strongest Giant

17B.C there's giant who named Dexzus. He is known as "The Strongest Giant". He got betrayed by his human friend named Kerr. After many years has passed in a modern world he got reincarnated into a man who also named Kerr. He wants a revenge but how can he execute his revenge if he know that Kerr is dead long time ago. Can he kill all the humans???