The more I look into them, the more I think they're typical couple on a shoujou manga.

Judging by the following post this should be Shinonome Harutora, but I'm not too sure due to the hair color.

OMGkillitwithfire said:

Judging by the following post this should be Shinonome Harutora, but I'm not too sure due to the hair color.

The bickering relationship between this mean guy and Suzuya is an obvious clue to him being Tora-nii.

laisy said:
The bickering relationship between this mean guy and Suzuya is an obvious clue to him being Tora-nii.

Figured as much, though I just find it weird that his hair here is light while the next one is dark, which should be considering he has his hair black.