Why Are The Akatsuki Kittens Here of all Places?

Introduction: Nura Tsubasa

{Picture above is Nura}.

Full Name: Nura Tsubasa
Nickname(s): Nu-Nu, Creeper, Lazy Girl, The Anime Otaku of the Family, Silent Ghost, Young Artist, The Girl Who Says "Life".
Age: 17
Gender: Female
Birth Date & Place: December 20 in Oshkosh, Wisconsin.
Appearance: {Picture Above}.
Personality: Unlike the rest of other sisters, Nura is silent, unfriendly, relaxed and a calm individual. She is vengeful and can be extremely violent. Also she is shown to have an emotionless demeanor which makes it hard for others to understand how she is feeling except the oldest sister and is emotionally insensitive most of the time. She has her own way of caring about her sisters and is very, very overprotective of her sisters, also she is intelligent in her own way and artistic. She is quite imaginative and is shown to be polite when she wants to be. Nura shows a crazed, sadistic and child-like side sometimes which had appeared for the no reason at all. She is understanding and somewhat supportive, also is creepy and is observant along with being ill-tempered.
Hobbies: Watching her sisters when they are sleeping, drawing anime, going on her computer, researching/watching anime 24/7, reading, writing, etc.
Likes: Sweets, being lonely, silence, anime related things, reading, writing, music, disturbing topics, horror stories, animals, learning, dark colors, mythological things, relaxing, etc.
Dislikes: {There is many dislikes}.
Abilities: {Later on}.
Other Info: Nura is shown to be strong than people her age and uses self defense against others along with using anime like attacks.
She is a bully hunter who is more brutal than her sisters making her more feared than admired and has a small group of friends.
Also it is revealed that she feels no attraction to anybody of any gender.
{Other Info shown later on in the story}.