Responses
If we compare this to nisekoi then yotsuba would be onodera and not chitoge. Onodera was the one who made the promise with raku and yotsuba was the one fuutaro liked when they were young also. Chitoge would be Itsuki, because even if their personalities are different, they were the first girl shown in the manga and the first girl the MC saw in adolescence.
Please, PLEASE don't let the series end like Nisekoi did. :[