Eiji like to bully others because he was bullied in elemental school. He want to appear strong so that no one sees and take advantage of his weakness. So he is secretive and never talks about his real emotion, hiding behind sarcasm. all of his "friends" aew bullies, and he doesn't really trust any of them, perhaps deep down he longs to find someone who will understand and accept him, but his sadistic tendencies and excessive arrogance prevent him from making real friends.