Haru is being a HUGE tsundere x)
Yet, i kinda saw something like "i will deny i admire him" in his own route. Given that he and mc knew each other for a very short time and he opened up, means that he IS emotional but doesn't show this.
Same with volleyball team. He insults everyone in the team, acts like an asshole and... keeps being there, keeps playing, even threw a thantrum when they lost a match. Meaning that he cares
(about "looking like hes inlove" - Kiga hinted that Haru indeed admires Sho. My guess is that he has a crush too, though its debatable. BUT i wouldnt be surprised if in Jun's or Kei's route they will end up dating or hooking up xD)