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dagehenshin
Nope, and that was the core problem with this manga. It really didn't have anything to offer besides the girls being cute. Though it was very, very successful on that aspect, this was the very predictable end of the fanbase. Great romcoms work under some sort of premise, be it club activities, dumb misunderstandings, supernatural wacky hijinks, etc, or just rely on a superb cast to keep things afloat while development is not happening. 5toubun had neither of those. It was like Nisekoi, a perfected romcom formula that sacrificed its soul in the process, but unlike the latter, it knew when to quit while it was on top.
It's now at the end that people realize how their enjoyment of the manga was tied to their favorite girl winning, and those who didn't pick Yotsuba now feel like they were duped. As you can see in the comments, most of the other sisters' fans are going through the five stages of grief:
-Denial: "Ha, ha, this is just a ruse. My quint will swoop in and get the guy. See her hair color! It's definitely not her! I'm not crazy!"
-Anger: "Dropped! What the f*** Negi? How could you be so dumb to make her win out of nowhere?!"
-Bargaining: "Maybe he'll make an ending for all the girls? H-how about a harem ending?"
-Depression: "I should never read harem romcoms again, they always end up disappointing me and making me sad."
Acceptance won't come. It never does with harem romcoms. To this day you can find people whining about the finales of Nisekoi, Hayate, TWGOK and even freaking Ranma 1/2 almost 30 years later.