Disclaimer: I do not own Inuyasha

Summary: Inuyasha encounters a mysterious girl who helps out the group in battle. What he doesn't know is that this girl could be his hanyou sister ?! And what is the big mystery surrounding this girl's mother? Why does she appear to have powers uniquely hers?

* * - thoughts *~*~*~*~*~*~*~*~*~*~* Prologue

The sky breaks open and a ray of sunligh shines on her back. Dawn approaches the castle passed down from generation to generation, and finally to Lord InuYoshito. The castle is magnificent and grand, with eight towers of varying heights. On the highest tower is a woma deep in thought. The light reflects off the lustre of her sparkling black hair, with a length all the way down to her knees.

"Oh Kami-sama, what have I done?" the woman whispers softly, a melodious voice full of sadness, unsuited for her heavenly and angelic face.

"Serenity!" the woman perks up hearing her name, and turns to the young man, or full youkai, running up the stairs. Her beloved stands before her.

Lord InuYoshito is a sight to behold. Lord over the Eastern Lands, not to mention a great dog youkai, Lord InuYoshito looks about the human age of 18, and has silky white waist-length hair, enchanting golden eyes, and a dazzling smile on his lips.

"What is the matter, love?" Lord InuYoshito asks, sensing tension in his lovely young wife. Serenity looks about 16 years old, and with a petite and fragile figure it's hard not to want to protect her against all evil. It was love at first sight for him, and despite many objections from other powerful youkais, Lord InuYoshito decided to marry this mysterious girl who seemingly appeared out of nowhere one day and captured his heart.

Serenity shakes her head slighty and remains silent, apparently still in thought.

"Look who's been crying for mommy since I woke up this morning," Lord InuYoshito teases, hoping to lighten up the mood. * It is so unlike Serenity, usually she is so cheerful and full of light * Lord InuYoshito reveals the bundle in his hand. He cradles a small baby girl, wrapped up in the finest silk of the Eastern Lands. The little baby girl looks to be newborn, not much older than a week, and already a little beauty taking after her parents. She has a mass of silky black hair, and a pair of piercing black eyes with a golden glint.

Serenity's face brightens and she takes her daughter into her arms, gently rocking her. The baby giggles and makes a gurgling sound showing her content.

* It is time to tell him the truth * Serenity's face darkens briefly * He deserves to know, afterall. Both he and my dear baby girl *

~Flashback~ Serenity was sitting in front of a mirror brushing her hair when a flash of purple light filled her room. When the light vanished, Sailor Pluto appears, time staff in hand. "You have to come home with me, Serenity-hime, your mother has been asking for you. I cannot stall my queen any longer. It is your destiny." "I understand, Pluto, please give me a little more time. I need to say goodbye to my love." Pluto sighed, she knew her princess and best friend well and knew how hard it is for Serenity to give up the one true happiness she's found. "Alright, hime, I will come and pick you up tomorrow morning. It is mandatory, hime, I'm sorry." ~End Flashback~

"Inu-kun, I have to leave"

"What?! What do you mean, Serenity? Why?"

"I have to leave.this castle.this era." Serenity's voice is almost inaudible, even to a full-blooded youkai's sensitive hearing.

"I don't understand, Serenity" panic fills Lord InuYoshitio's voice as he thinks about the possibility of losing his beloved.

"I don't belong here, Inu-kun, even though I love you and my daughter dearly"

"But why?"

Serenity sighs. She has one way to convince him.

"I will show you"

Serenity closes her eyes and concentrates. Suddenly she is surrounded by an intense silver light. The light feels extremely warm to Lord InuYoshito and he relaxes, closing his eyes. When he opens them again, Lord InuYoshito gaps at the sight he sees. He finds himself staring at what he could only describe as a goddess.

Her now silver hair is done in two buns on top of her head, with silver hair trailing behind the buns. Her eyes are now the color of cerulean blue. Serenity is dressed in her white princess dress with a crown on her head and an upturned crescent moon symbol on her forehead. Serenity holds herself royally and looks apologetically at Lord InuYoshito.

"I am Princess Serenity of the Moon Kingdom"

Lord InuYoshito stands there dumbfolded and speechless, still trying to process what he just heard. He always knew his wife was special, but a princess?

"Do you HAVE to leave?" Lord InuYoshito asks solemnly. If this is what she wants, then he would respect her decision. He just wants her to be happy.

".It is what the Fates have ordained."

"What about Yinyin, our daughter?"

".She is yours, she was never mine to begin with, I can't impose my life on her."

"I understand" Lord InuYoshito sadly acknowledges his wife's departure

Serenity blinks back tears on the verge of rolling down her cheeks. She can't cry, but she will miss them so much. All she has to go back to is an imposed marriage between the Princess of the Moon Kingdom and the Prince of Earth, that arrogant brat.

Serenity kisses her daughter goodbye on the cheeks and hands her to Lord InuYoshito. * grow up happily, Yinyin, choose your own life * with that thought, she binds them farewell.

A flash of purple light and Sailor Pluto appears. Serenity nods slightly and Pluto waves her time staff. A large portal appears before Serenity and she steps through, not looking back.

Lord InuYoshito is left standing alone on the highest tower holding his only daughter. A breeze blows past them, and even the great dog youkai shivers, feeling the chill of that moment.