Well, well... Even if Chitoge turn out to be the winner, I'm sure Raku don't like to be harsh on the other. Especially Marika, it'll be too harsh for her. She will be like "Why?!? Why it isn't me?!? I'm supposed to be the one to marry you! You said you promised me that! I'll kill you if you don't pick me! I'll kill you if you don't marry me! I really will kill you..." Ouch... I made her sound like a yandere...
Anyway, a somewhat open end would be a bit better, even though Chitoge was likely to be one winning. I'm sure Raku would fulfill their desires and make them happy with a fair share, by one night stand~ hue hue~
Damn, I don't wanna see this to end like Oreimo. :/