Saru is a friend of Michishio from school and he (as most of the guys) has a crush on San. He and Kai quickly become best friends. The reason for that is Kai’s money. But he becomes his most loyal friend and is always ready to sacrifice himself in the name of his beloved “master”. From time to time, when the plot requires it, he becomes a pervert old man. He is actually a parody of a monkey. Saru is a nice and charming character. He perfectly completes the story of the anime.