According to the game's background story, Raiden Makoto and Raiden Ei are twin sisters.
Although they look exactly alike, they have slight differences in personality.
The older sister, Raiden Makoto, is gentle and quiet, not skilled in combat, and seeks a peaceful life.
She is a proper soft and adorable girl.
The younger sister, Raiden Ei, is skilled in martial arts, and all battles, big and small, are handled by her.
In Ei's view, dueling is a very good way to solve problems.
Of course, Ei is not just full of martial arts.
In her heart, she is also full of various curiosities about this world.
In public, she is the cold-hearted Raiden Shogun.
But behind closed doors, she is a country Country bumpkin who likes to eat desserts, is interested in novels, and is a bit silly.
These twin sisters ruled Inazuma together; the elder sister handled civil affairs, and the younger sister handled military matters.
They complemented each other, managing Inazuma in an orderly manner.
However, such a peaceful life was broken by the later Khaenri'ah war.
Raiden Makoto sensed the crisis of Khaenri'ah, and she deliberately hid this matter from her younger sister, wanting Ei to live well.
Raiden Makoto, who was not skilled in martial arts, took her sister's place and embarked on the Khaenri'ah war.
By the time Ei arrived in Khaenri'ah, her older sister, Raiden Makoto, was already lying on the ground, her body gradually growing cold.
After that, Ei lived in guilt and self-blame.
She regretted arriving too late and failing to protect her older sister.
To this day, the Khaenri'ah war is still a nightmare Raiden Ei cannot forget.
If possible, Ei would be willing to pay any price, even her own life, to bring back her older sister Raiden Makoto's life.
Seeing her older sister Raiden Makoto again now, Ei was completely stunned.
She tried to speak several times but couldn't get the words out.
It turns out that when one's longing for someone reaches its peak, it's truly impossible to speak when reunited.
Instead, Raiden Makoto quietly looked at Ei in front of her, then smiled lightly and said, "Ei, long time no see."
"I left my will in Musou Isshin; when you unleash the full power of this weapon, my will shall appear."
Raiden Makoto clasped her hands behind her back, a faint smile on her face.
When she looked at her younger sister Raiden Ei, her eyes were filled with doting affection and tenderness.
"I'm sorry, Ei."
"I suddenly entrusted Inazuma to you without any preparation."
"I should have gradually taught you the methods of governing Inazuma."
"It was my dereliction of duty that made you bear such sudden pressure."
"I think... you must have been at a loss and very flustered at that time, right?"
"For this, you must have put in a lot of effort; I can imagine the hardships and bitterness involved."
"I'm sorry, this is all my fault for making you clean up my mess."
Raiden Makoto's eyes dimmed, and her tone was filled with deep self-reproach.
Just thinking about all the pressure of Inazuma falling on her younger sister's shoulders after she left, Raiden Makoto felt sad.
Her nose felt sour, and tears welled up in her eyes.
However, upon hearing this, Raiden Ei shook her head gently, her expression very relaxed.
"Makoto, I don't think it's troublesome, nor do I think what you left behind was a mess."
"Because Inazuma is the nation we govern together; it is our home."
"After you left, I followed your will and strived to build Inazuma into a nation of eternity."
"The people of Inazuma live in peace and contentment, forever free from war, sorrow, and stable and peaceful."
"What you couldn't complete, I will complete."
"Because you are my older sister, and our wills are one."
Although Raiden Ei's voice was not loud, it was strong and resonant.
After Makoto's passing, Ei became Makoto's shadow.
She wanted to fulfill her older sister's regrets.
Upon hearing this reply, Raiden Makoto's face showed a relieved smile.
"Ei, you've grown up."
"You've become the true Raiden Shogun that the people of Inazuma need."
"It's just a pity that I cannot witness the future of Inazuma, nor can I walk with you anymore."
"But knowing that you possess our shared will, there isn't as much regret."
"With you governing Inazuma, I am at ease."
"This time, it's truly goodbye, Ei."
Raiden Makoto, with a smile on her face, waved goodbye to her younger sister Ei.
Her figure began to gradually dissipate, turning into cherry blossoms scattering in the air.
Raiden Ei reached out her hand, wanting to hold her older sister, as if that would prevent her from leaving.
But she couldn't touch Raiden Makoto; only cherry blossom petals remained in her palm.
Tears fell silently as Raiden Ei quietly watched this sea of cherry blossoms.
Many years ago, Raiden Makoto lay in Ei's arms and quietly passed away.
Many years later, Ei experienced the pain of separation again.
How exactly can one achieve the so-called eternity?
Seeing this scene, Makoto naturally couldn't bear to watch Raiden Makoto leave like this.
In the game, the sisters Makoto and Ei also had a difficult relationship.
Raiden Makoto, such a lovely soft girl, selflessly sacrificed for her younger sister and for Inazuma.
Why didn't she have a good ending?
And in the end, Raiden Ei was left heartbroken.
Because of this,
Makoto wanted to change, to change some things.
He tried to create a puppet to give Makoto a new life.
But what Makoto left in Musou Isshin was only a fragmented will, not a complete soul.
Furthermore, as the first Raiden Shogun, Makoto's divine power was incomparable to that of ordinary Gods.
It's estimated that Ei had already tried to revive Makoto by creating a puppet, but it didn't succeed.
The method of creating a puppet for Makoto was unfeasible.
At this moment, the system's voice resounded in Makoto's mind.
"Note: To ensure the stability of the current Teyvat continent,"
"the scope of historical modification in the Book of History is limited; modifications exceeding the limit will be invalid."
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