yes Because (SPOILER!) He kissed her in the shugo chara encore manga chapter 1
In the anime nothing happens but in the anime it shows that Kukai and Utau are going out and that Utau only likes Kukai and gave Ikuto up to Amu.
Yes They Do But Actually Utau Kisses Him. That's When Amu And Kukai Realized They Were Siblings.
Well, it is not known for sure. But, it turns out they've been hanging out ever since they met. Their competivness is also a key factor to some chemistry. Kukai doesn't have to act like a big brother to Utau and Utau needs to expand her world beyond Sanjo, Amu, and Ikuto. So it is a very possible couple. But, recently in the newly released manga (Shugo chara! Encore!) Utau and Kukai kiss! And it seems that they do love each other.
Shugo chara Shugo chara Doki Shugo chara Party
"Utau's Wavering Heart" - Utau storms out of a recording session for her new song because the director tells her to sing in some other way but she refuses, and goes to eat ramen with Kukai to cool her head. But when even her favorite ramen shop changes their recipe in response to customer feedback, Utau get mad and Kukai tells her at times like this she should go talk to her 'female friend' and that 'female friend is none other than Amu. Amu is shocked when Utau appears at her house, but Amu's family is very happy to see Utau. The two of them go out to talk. Then, an X Egg, which kept saying 'I don't wanna,' appears. Utau get annoyed and says to it "Why dont you try the thing you don't want to; maybe it turn out to be more greater than you ever thought." Amu says that Utau's right. Just then, Utau realizes that her behaviour in the studio was wrong. Amu purifies the X Egg and Utau says 'Thank You' to Amu, though she didn't know what Utau meant. Utau goes back to the studio and apologizes to the director and records the new song.
Utau storms out of a recording session for her new song because the director tells her to sing in some other way but she refuses, and goes to eat ramen with Kukai to cool her head. But when even her favorite ramen shop changes their recipe in response to customer feedback, Utau get mad and Kukai tells her at times like this she should go talk to her 'female friend' and that 'female friend is none other than Amu. Amu is shocked when Utau appears at her house, but Amu's family is very happy to see Utau. The two of them go out to talk. Then, an X egg, which kept saying 'I don't wanna,' appears. Utau get annoyed and says to it "Why dont you try the thing you don't want to; maybe it turn out to be more greater than you ever thought." Amu says that Utau's right. Just then, Utau realizes that her behaviour in the studio was wrong. Amu purifies the X egg and Utau says 'Thank You' to Amu, though she didn't know what Utau meant. Utau goes back to the studio and apologizes to the director and records the new song.
Kukai has written: 'Kukai no reigen'
I wouldn't call it love, but it seems Yaya looks up to him as a big brother type of person.
It haven't been released yet, But in manga's you can find one, Actually there are 4 story's:~1st: Kukai and Utau~2nd: Nagihiko and Rima~3rd: Kairi and Yaya~4th: Ikuto, Tadase and Amu
Yes,I think She likes Ikuto a little bit because I saw in the cartoon book number one Shugo Chara.There is side story,and I watched it.Ran asks Amu "who do you want to be date with?" and Amu says "Of course it is..."and she tried to think about Tadase,but in her mind,there is also Kukai and Ikuto.I bet there is Nagihiko,too.
Amu does not go to Kukai`s house but Tadase does
UTAU is a free program and you can find it by googeling "UTAU download" that's what i did anyway...