It's harem. By definition, everyone is in love with her and will probably be kept wide open as an option until the very last chapter of the very last volume (which won't be written until it's milked it's popularity as much as possible).
Don't expect any resolution any time soon. And when it comes: the decision will likely be fan-driven. Ie. Hana to Yume readers will be polled or their letters taken into account and the winner of the day will be the fan-favorite.