|Spicy Pink <-- 2 couples, equally divided.
Karakuri Odetto <-- not really real couples, but you'll see.
Emma 100% the one that you're looking for!
Spoiler (highlight to view)
Different couples:different stories and yet still stick to the main point.
Emma X William
Richard X Aurelia (William's parents' back story)
Kelly X Al (makes me sad) T___T
Wilhelm X Dorothea (My favourite)
and srsly, if you read it, dont just drop the manga just by reading vol.1... I fell completely in love with the manga at 3-4 volume.
The Hidden Agenda=Gol.D.Ace
This Week's favourite:
DoLL (Okado Tatsuya)