I wonder what Yuna response will be on a question that Kiku asked her.
1. She can hesitate with response cuz it's her only family and can wonder what Kiku mean by having her.
2. If she hesitate with the response, and if she will or not agree to that, but her voice give that unsure responed vibe, it could mean that Yuna may or not has same feelings as Sena or it maybe like I said above its her only family after all so feelings can be deep but not necessary romantic.
(But since it's incest and love triangle than it possible that Yuna mey have those feelings for Sena as well)
3. Let's say Yuna agree but why she would do that? A) she and kiku broke up but Kiku still has feelings for her so in Yuna replace Sena comes in ( they're sisters so they can look similar), B) Yuna knows that Kiku has feelings for Sena, but if so when did she start liking her, before they broke up and it was the cause of it, or after break up and Yuna leaving abroad.
Well i wouldn't like if it turns out 3a, wlthere was a lot manga like that already so it would be kind of boring.
This manga is kind of like that one that has completed recently(forgot the title) it Teacher, student and teacher ex where the student was like a substitution for teacher ex, of course at the end tbe feeling were mutual. Or like that manga with twins also incest tag, the younger sis with longer hair was imitating her older sis for that they could look alike in everything, and then this teacher comes in which older sis falls in love, also the sisters best friend I think she also did had feelings for one of those sis.