Fujinomiya Atsushi

The next head of the Fujinomiya family, second only to the main Itsukino family.
Intelligent, cool-headed, and possessing a charismatic air that belies his age.

While he was previously on friendly terms with Naoya as his cousin, he now detests him as a sworn enemy, eventually declaring war on the Itsukino family and Naoya in a "coup d'état".