The third season of Junjou Romantica. 

It follows the ongoing story of three couples:
 
The Romantica relationship between college student Misaki Takahashi and his tutor, Akihiko Usami.
 
The stormy Egoist couple—Professor Hiroki Kamijou, a tsundere, doted on by Nowaki Kusama.
 
The dramatic Terrorist couple—divorced literature professor Yo Miyagi, and his younger lover, Shinobu Tatasuki.
 
It’s complicated.
 
But so worth it.
 
(Source: Crunchyroll, edited)