In the end, I only, well, only feel real real bad for Kiku only. Being stuck with these stupid sisters must be tough. And I never understand why most of the drama story I have read started with the lack of communication. I know it's for the sake of drama, I know your love is forbidden but for fk sack Sena, you were already willing to distance yourself from Yuuna, telling her the reason (even through letter or something) wouldn't cause any more damage. You feared of losing your sister, and now it's better when she is about to get married away? For real lol. Imagine if Kiku wasn't involved, Yuuna would still get married and have her sister stray farther away from her, while Sena would keep living in loneliness and regret. Honestly I'm more than fine with that.
So yeah, the only person I actually like in this story is Kiku. Just leave her away from this mess please. She deserves someone way better. Though of course the author won't do that lol. I'm afraid Sena may end up just like Sei from It's a Detached Relationship, never move on from loving Yuuna, but since she starts to also love Kiku, and since Kiku is just too good as a person, she can accept that.
And to think it's from the same author of the unicorn series.