Sister's Story

The Sisters' Story is a song trilogy about two sisters, starring GUMI and Hatsune Miku.

Beginning with the song "On My Seventh Birthday," released on May 21st of 2013, continuing with a second song, " A Single Heart and i" releasing on January 24th of 2014 and ending when "To Celebrate You Two, I'm Here" was released on June 25th, 2015.

## Background

The Sisters' Story is a song trilogy about two sisters, starring GUMI and Hatsune Miku.

Beginning with the song "On My Seventh Birthday," released on May 21st of 2013, continuing with a second song, " A Single Heart and I" releasing on January 24th of 2014 and ending when "To Celebrate You Two, I'm Here" was released on June 25th, 2015.

The story tells the tale of two sisters, Amaterasu and Tsukuyomi (Tsukuyomi represented by GUMI, Amaterasu represented by Miku.)

Tsukuyomi and Amaterasu are sisters, Tsukuyomi is the elder one, described as mature, whereas Amaterasu is the younger one, described as playful.

As children, Tsukuyomi notices that her younger sister hates and envies her for being beautiful and gaining positive attention from their peers, thus calling Amaterasu a "Demon" or a "Hannya", which is the Japanese term for a jealous women who turned into a demon because of her envy, describing Amaterasu behavior and how she is acting perfectly.

On Amaterasu's 7th birthday, they both get into a petty argument and fight, which results in Amaterasu stabbing Tsukuyomi in the abdomen with a staff, killing her. Then, Amaterasu proceeds to bury her sister secretly at night, As she does this she sings and dances around the grave, telling her dead sister that she loved her.

With Tsukuyomi gone, Amaterasu takes her place and pretends to be her, thus covering up her crime and making it as if it was Amaterasu who had died.

A decade passes, after deceiving everyone, Amaterasu is now in her adolescence years, still with the appearance of her dead sister minus the glasses.

She begins to believe that she really is Tsukuyomi, and that her younger sister is out to kill her after seeing a spirit that look like an older version of her, who is in reality Tsukuyomi's spirit, disguised as her sister, trying to confuse her.

Tsukuyomi's plan succeeds, as by Amaterasu 19th birthday, her sanity unraveled as questiones her own identity, unable to remember which sister she is.

Her appearance changes, one side is cut up short with an almost bare forehead, while another side is tied in a single twintail with long bangs. Looking in the mirror, Amaterasu sees them both as one person, as if their souls had become one, when in reality, they're still two different people.

"I am you and you are me." Amaterasu truly starts believing that she is a vessel that holds 2 souls, hers and her sister, Tsukuyomi.

She lets out a cry as she hears her sister's screams from inside of her stomach, making Amaterasu stabs herself in the same place she stabbed her sister on her 7th birthday, in order to escape her madness and the voice of her sister she keeps hearing, therefore ending 'two' lives at once.

In the end, while bleeding to death, she realizes that she is in reality Amaterasu, and that she killed her sister Tsukuyomi, not the other way around.

It is then implied in the songs that Tsukuyomi, once Amaterasu died, possess her body and lives on.

### On My Seventh Celebration

> "The end is the beginning. The names of the girls are Tsukuyomi and Amaterasu."
>
>

On Amaterasu seventh birthday, her and her sister have a petty argument which leads to Amaterasu stabbing Tsukuyomi through the abdomen with a staff, and to avoid the blame for her death, takes the appearance of her sister.

The PV can be a bit misleading, as it is displayed that Amaterasu stabbed both herself and her sister. However, this can be a metaphor for how they are "one and the same".

### A Single Heart And I

> "That there is a story of sisters. One day, I have noticed that one of the girls has become inconsistent. Goodbye."
>
>

Decades later, the deceased spirit of Tsukuyomi comes back to haunt Amaterasu, disguised as her sister, causing confusion in Amaterasu, making her question who she truly is.

#### To Celebrate You Two, I'm Here

> "That is a story of two sisters who became one person. The outcome is wonderful. Also deceased is the beautiful you."
>
>

Amaterasu can't tell which sister she is as a result of Tsukuyomi's influence, causing the her to have half of the two's hair styles.

In the dead of night, Amaterasu hears the piercing scream of Tsukuyomi coming from her abdomen, and Amaterasu, in attempt to stop the noise, stabs her own abdomen.

Finally, as she slowly dies, she realizes that she has been the younger sister all along, and that she was the murderer of her older sister.

Amaterasu's corpse is seen smiling with an open mouth at the end of the PV, laughing and humming even, this heavily implies the fact that Tsukuyomi, possessed her sister's body after her death.

### Demon's March

> "Demons and will-o'-the-wisp"
>
>

This is song is not part of the Sister's Story, as it's only meant to be a contribute to Masa's popular series. However, it features the final look of Amaterasu that was seen in "To Celebrate You Two, I'm Here".

## A Different Interpretation

There is a different interpretation of the sister story, but for being non confirmed by Masa and incorrect, it was deemed non canon and irrelevant. I feel like it definitely deserves a honorable mention here.

The Two sisters were originally one soul, a Hannya mask, somehow, the soul splits, resulting in both Tsukuyomi and Amaterasu.

At some point (Presumably on their 7th birthday/celebration), they both figure out what happened to their original soul, and they vow to correct it by stabbing each other at the same, thus killing each other at once, in hopes that the soul will become whole again.

They carry out their plan, but it doesn't work out because unlike Tsukuyomi, Amaterasu doesn't die, as a result of her attempt accidently failing, following this Amaterasu pretends to be her sister and covers up everything as she lies to everyone.

Eventually, Amaterasu dies and the soul splits again, reincarnating in another body, however, the soul is split despite being in the same body. The host of the body, finds out about this on her 19th birthday, and goes insane as of having 2 souls inside her at once.

She then decided to take on the plan of the sisters and enacts it, killing herself with a stab in her abdomen, in hopes that the 2 souls will become one again.

Luckily, the plan finally works, and the soul of the Hannya mask becomes one again, ending the cycle of suffering for the two sisters.

## Theories

* In the "On My 7th Celebration" PV, both sisters are portrayed by the Hannya mask, representing envy, it is understandable for Amaterasu, but the reason for why Tsukuyomi was portrayed as jealous of her sister is unknown, but it could be because Amaterasu got to be the young and playful sister, while Tsukuyomi got to be just the "mature and beautiful" sister, who had to keep an image.

* In the "To Celebrate You Two, I'm Here" PV, Tsukuyomi is portrayed by a noh mask, which represents a beautiful women, this can possibly be how Amaterasu saw her sister, a women much more beautiful that her, whereas she was just a demon.

* In "Demon's March", it is mentioned that one of the twins' head is turning into flowers, this could be alluring to the imagery in "To Celebrate You Two, I'm Here" PV of Tsukuyomi's head with flowers. Which be interpreted as the ikebana flower arrangement, used to describe beauty. Or it can be seen as flowers growing in Tsukuyomi's grave.

* Amaterasu pretending to be her sister poses a lot of issues, as they clearly don't have the same voice, it is possible that Amaterasu made a deal with a demon of some sorts to sound like her sister but it's considered a bit of a stretch since the sister are both twins.

* Amaterasu disguising herself as Tsukuyomi to avoid the blame of killing her is considered a bit strange, as people would still be concerned about the death of the other sister, but it's possible that people did not like Amaterasu enough to care.

## Trivia

* The Sister's story takes place around the Taisho period (1912-1926), which is a bit after The Onibi Series.

## Songs

* 私ノ七ツノオ祝イニ /Watashi no Nanatsu no Oiwai ni/(On My Seventh Birthday.)

* 私ト一ツノ心臓ヲ/ (Me and a Heart)

* 私ハ二人ノオ祝イニ/ (To Celebrate You Two, I'm Here)