|Last Boss, The Sinner of Eternity and the Moment
Ability: Manipulation of eternity and the moment
Kaguya was born in the royal house of the moon and was treated with utmost care as a princess. Because of that, she grew very selfish... But one scandal changed her life. She had Eirin make the Hourai Elixir - a forbidden medicine - out of self-interest and consumed it.
The crime was soon discovered and Kaguya was executed for it.
However, Kaguya held the power of eternity, so she reincarnated immediately after each execution and wouldn't die permanently. Instead of killing her repeatedly, she was exiled to Earth and forced to live among filthy humans as punishment. Soon afterward, she was found by an old human male, and began life as Kaguya-hime...
Kaguya is a former Lunarian who was expelled from the moon. She enjoyed her life on Earth for a while without problems, but as rumours of her beauty spread far and wide, she started to feel bad about it.
A few years later, she was allowed to return to the moon, but she really didn't want to. She had become attached to people who she were living with and preferred life on Earth, which was far more emotional than the life she had on the moon. Even so, Earth was a bit filthy and life on Earth had its share of problems. She was torn between Earth and the moon... It was then that she found a familiar face among the emissaries from the moon. It was Eirin.
Eirin felt very sorry for Kaguya because she wasn't punished even though she was the one who made the elixir. Her desire for redemption was so strong that she was ready to do anything for Kaguya, so she decided to live on Earth with Kaguya.
Eirin betrayed the other emissaries and helped Kaguya escape. The two of them began to live in desolate place. It was so desolate that it was haunted by youkai...
A long, long time has passed since then.
The moon was no longer sending emissaries to fetch them; they had forgotten about the past and were living in peace.
One day, an event took place that made them recall the past.
It had almost been a century since Gensokyo was sealed. They were living quietly without meeting anyone. On that day, a rabbit ran into their home. She claimed to be a rabbit from the moon who had come because she heard rumours about Gensokyo, a place where non-humans live. She then said, "Humans are invading the moon and it's becoming nearly impossible for people of the Moon to live there. These humans stuck a flag on the moon and are acting like the moon belongs to them".
The rabbit had escaped from the front line of a war, leaving her allies behind...
Kaguya remembered that she, too, was a Lunarian long ago.
Humans were invading the moon?
But the rabbit seemed to be telling the truth.
Anyway, they decided to allow that poor rabbit - Reisen - to live with them.
A few decades have passed since then.
Kaguya, Eirin and Reisen were enjoying their peaceful life.
Gensokyo makes everyone easy-going and peaceful... It really was like a paradise.
On one night of a full moon, Reisen received a transmission from other surviving moon rabbits. (Moon rabbits have some kind of telepathic ability and can communicate across great distances.)
- "These filthy humans are exploiting the power of the moon and trying to build a base here. We've been urging them co-exist peacefully with us, but they never listen. We're up against a wall. We've decided to declare a final war against them.
- "The tide of war is currently slightly in their favour... Their modern weaponry is far better than we expected. But don't worry, we have the wisdom and pride of our millennia of history... We will never lose.
- "Dear Reisen, a war will be starting soon. Please come back and fight at our side.
- "Also, please tell the humans you're living with... That we're coming to take you back with us on the next full moon. Refusal is not an option."
Reisen told them that she needed to return to the moon, but... Kaguya and Eirin were part of the Lunarian race as well.
Kaguya remembered her past.
- A past of innocence.
- A life of living with humans.
- A memory of murdering emissaries and going into hiding.
Kaguya had a discussion with Eirin, then decided to defend Reisen from the moon's emissaries. But if they kill the emissaries, they'll have to go into hiding for a long time again. If only there was a way to make it impossible for the emissaries to reach them, then they would never have to hide again.
Just as Kaguya was about to finish speaking, Eirin presented her solution.
- "If we remove the full moon from Earth, then the path between Earth and the Moon will be closed. A full moon from Earth is what makes it possible for them to come here. That's why the Lunarians only visit on nights with a full moon. If we corrupt that full moon... Earth will become a large, sealed chamber."
Thus, they hid the true moon from Earth, replacing it with a fake moon that will never be full.
It was no longer possible to travel between Earth and the Moon.
Their only mistake was underestimating the power of Gensokyo's natives, who rely on the power of the moon...
In the end, humans and youkai succeeded in dispelling the fake moon. But that wasn't a problem... Gensokyo was already sealed by the Hakurei border, so the Lunarians wouldn't have been able to enter Gensokyo to begin with.
Kaguya, Eirin and Reisen have come out of hiding and are living freely in Eientei.
So, what was the outcome of the Moon War?
That didn't matter to Kaguya anymore; Gensokyo is now her home...