These are some facts and aspects which will be involved in this story.
1)Yuki is most closest to Natsume.
2) Yuki is the only person that Fuuto is most comfortable around and doesn't tease. He goes to her for help in his singing career or emotional support.
3) Wataru is convinced that no matter what happens, Yuki would never lie. Not to him or to anyone.
4) Yuki and all the brothers are very close. The brothers also share some of their difficulties with Yuki and she always helps out.
5) This book contains slight mature content, abusive language, and some gore.
6) Ever since Wataru was born, Yuki spent the most time with him and had a huge role in raising him and that's why they both are very close to each other.