Don't make useless posts, animus, or I'll give you something worse than neg rep for your troublemaking.

Nevertheless, while I maintain Kei is arrogant, not depending on that his personality surely needs to be like it is for the story to go anywhere. His cool pride was also shown in how he defended Hikari's efforts in front of the delinquents (before beating them up). It's reasonable to assume he was like that even before he met Hikari all those years ago, but I wonder if he's also partially kept going because he knows Hikari is right below him and uses all her efforts to close the gap. Hikari's source of motivation is indeed easy to understand but what is Kei's motivation? And though something else existed for him earlier, but does Hikari now play a role there as well?

Their relationship, or a potential for a deeper relationship, looks quite fragile to me. Hikari seems to view Kei only as a rival so is it up to Kei to make the first move? And can he do it?