Summoning, reminds me of F/SN or FZ LOL.
Anyways I surprisingly like this anime after catching up to all of S1 and the 4-S2 episodes. I think I just needed a lighthearted anime to compliment the mix of Despair, Seriousness, and Philosophy that dominates my watch list this season LOL.
As for relationships, this series is quite hard for me to pin down on what to like...I'd just agree with a previous comment and say that polygamy is where it's at for this series lawlz.
And jeez I still get my head to literally look away from the screen everytime a sub spells Cinque's name as Sink. Sheesh.