The Familiar of Zero Rondo of Princesses, Japanese anime tv series 2008

Story:

With the seemingly unending war with Albion now far past them, Saito and Louise finally get a chance to return to Tristain for some much needed rest and relaxation. All their plans go down the drain, however, when the runes the bind them together suddenly disappear. With no magical force to make sure they don’t stray from each other, Saito and Louise find that a relationship that is no longer defined as “Master and Familiar” is pretty hard to maintain, and even harder to get used to! The adventure continues on as the former Zero now turned Hero and his newly empowered master discover more about each other than ever before in their quest to recover their lost runes in ‪The Familiar of Zero: Rondo of Princesses! (story by Sentai Filmworks)

External Link: Official Website