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Monkey D. Luffy has always been an interesting child.
He's quiet, but when he speaks, it's as if he's shouting.
He's kind, but his eyes shine coldly.
He claims to love the night, but his small hands form fists when the moon appears.
Luffy has always been a rather solitary child, although he seems to be surrounded by people. In fact, the closest people are Portgas D. Ace and Sabo, the only ones he seems to tolerate at a distance. They're a trio who are always together but aren't close.
Sometimes, if someone looks closely, they can see how the sun, the moon, the stars, the waters, and everything around them seem to bow down to him, as if he were their lord.
Sometimes, when his eyes shine furiously, the sun seems to heat up even more out of nowhere.
Sometimes... he just doesn't seem human.
When Izanagi's Three Precious Children were created, each one obtained their own domain.
Amaterasu Omikami, the eldest, became the god of the sun and the universe. Tsukuyomi no Mikoto, the second son, took the moon and the night. Finally, the third, Susanoo no Mikoto, took the seas and storms.
Izanagi had many children, but none as brilliant as Amaterasu. So Izanagi then decided that Amaterasu would be the Lord of the Universe and with it, the ruler of the Realm of the Gods, Takamagahara. After that, it wasn't long before Amaterasu became the most sacred god, second only to Izanagi himself.
It also wasn't long before Amaterasu and Tsukuyomi were married, uniting night and day in an eternal eclipse. And for eons, things remained that way. The two brothers married and both sat as rulers of Takamagahara, although Tsukuyomi had no true power when there was only one throne.
Unfortunately, things would change when Amaterasu sent Tsukuyomi to fetch the goddess Ukemochi, the goddess of food. The goddess prepared a feast for his arrival, giving him food that she herself vomited. Disgusted, Tsukuyomi murdered her, and Amaterasu decided to separate from him, furious that he had killed his sister and best friend.
This is how the eclipse separated for the first time in eons to give way to night and day.
However, Tsukuyomi would not stand idly by either; eons had passed with him as a mere consort of the great deity known as Amaterasu. He could only watch from afar, jealously, as Amaterasu sat on the throne and he was a consort when things should have been the other way around. For although Tsukuyomi was eager to possess the throne of Takamagahara and remove his former spouse from it, he still loved Amaterasu and wanted him as his consort.
In a short time, the union that had been formed with love and respect turned into a relationship of hate and love, where Amaterasu felt nothing for her brother, while Tsukuyomi still loved him just as much as he hated him. It was a complicated relationship that reached a horrific point where Takamagahara and many universes were included in the fight, where mortal beings and entire universes died in the fight between the sun and the moon.
Tired of the fight for the throne, Izanagi finally delivers his verdict.
Both gods will be transmigrated to a random world. There, their mission will be to control the world and kill the mortal body the other inhabited. Whoever wins in the end, that god will sit on the throne of Takamagahara as the new Lord of the Universe.
This is how Amaterasu and Tsukuyomi end up in another universe where Tsukuyomi took the name Imu and Amaterasu the name Joyboy. Unfortunately for Amaterasu, Imu won and managed to kill Joyboy, but he didn't finish him off. At the last minute, he escaped his mortal body and evaded Imu for eight hundred years while pulling strings to make specific things happen for his return.
Finally, Amaterasu returns in Monkey D. Luffy's body, where he decides to be more discreet until he has powerful allies to fight against Imu's allies. Imu and him are fighting in mortal bodies but with divine powers that give them an advantage over everyone in the world. All while they were both playing chess, using the world as their board and its inhabitants as their pawns. Both with the sole purpose of winning, without caring who they would end up killing.
In another life, it may have been different, but they were both gods, and gods are cruel.
The Great August God Who Shines in the Heaven.
Monkey D. Luffy.
Luffy sighs, he has fallen so low. From a powerful deity who ruled all that exists, to a mortal body with the powers of a mere demigod. At least he's happy to know that Tsukuyomi is in the same boat as him.
Luffy watches the two mortal children sleep with a frightening coldness.
For Luffy, those two children were just simple pawns on his chessboard, an extension of the threads of fate he's been pulling for over eight hundred years. He's been the cataclysm, the mastermind behind many things. Behind what happened in God Valley, behind what happened to Kaido, behind what happened to the Rocks Pirates, behind the dramatic death of the Pirate King.
He was that whisper.
And it had all culminated in the two children in front of him who would equally serve his plans. Ace and Sabo had a destiny to fulfill before Luffy decided his work was done. He knew it was a cruel thought, but he was a god, and gods were cruel.
They may have done good deeds, but gods always had a motive behind their actions.
Unfortunately for the world, he wasn't much different.