Love Joto!

Love Joto! manga summary: First year Hino Teppei of East High has a lifelong enemy. His nickname is "The Demon of the West," but his actual name is Onikubo: a second year whose goal in life is to tangle with East High students. No matter how many times Onikubo gets called out, he's so strong that no one can make a dent… and yet, he only has eyes for cute things!