My youth story, a crossover anime, turns out, is FGO!

Hachiman Hikigaya delivered the crucial blow.

The golden blade pierced through the massive wound on Tiamat's head, penetrating into her exposed spiritual core.

"AaaaaaaaaaArrrrrrr——"

Tiamat let out a mournful cry, and her beautiful star-like eyes seemed to dim. Everyone knew that she was at her last gasp.

Even her anti-genesis barrier, which rejected all past lives, lost its effect and quietly shattered.

Hachiman Hikigaya fell from the sky and was caught by Skadi using her powers. He looked at Tiamat with a very complicated expression.

Originally, although Hachiman Hikigaya could not understand the so-called "return", he also felt the deep maternal love in his dream before Tiamat woke up.

Tiamat loved her children, but it was this love that caused them to go their separate ways.

After all, children always grow up, and Tiamat, who was abandoned, simply wanted to become the mother of all things again.

"Mother."

Hachiman Hikigaya's voice was soft, as if he were saying goodbye to Tiamat: "Children always grow up and always leave their mothers."

Goodbye, Mom.

"Aaaaaaaa!!"

Tiamat is still struggling; she wants to escape, but with her core shattered, she can only gradually weaken.

Perhaps if she escapes the Land of Shadows and regains her immortality, she might still have a chance to recover, but now, will the Heroic Spirits still let her go?

Even if the Heroic Spirits don't do much, the suppression from the Land of Shadows and the ever-present swirling ice of death will gradually lead Tiamat toward her death.

Achilles glanced at Tiamat and unexpectedly said, "I'm sorry, I won't be participating in the next battle."

“This isn’t like you, Achilles,” Cú Chulainn said, quite surprised. “You couldn’t possibly be completely immobile, could you? Well, in your condition back then, you were practically dead.”

With his spirit origin damaged, his spirit core shattered, and his magic circuits in his body in disarray, Achilles here is, in a sense, already dead.

However, as a hero, how could he not overcome mere death? So Achilles was still standing there, and Cú Chulainn had thought he would force himself to participate in the final battle.

After all, this man would not stop; he would want to fight until the very last moment of his life.

Just as Achilles' mother Thetis had received a prophecy that Achilles would die young, she also asked her son whether he wanted to live a simple and ordinary life as an ordinary person, or to live a life as a hero, as bright but short-lived as a shooting star.

Achilles chose the latter.

“How could I be unable to move if it’s a battle?” Achilles retorted, dissatisfied. “As a hero, I will never back down in anything.”

"This is the final battle, clearly only one last fight left." Cú Chulainn was somewhat puzzled. If he wasn't powerless, why was he leaving?

“Yes, I love fighting, and if I could, I would fight to the very end,” Achilles said calmly, his golden eyes still shining brightly. “But I can also reflect on my actions.”

"As a hero, I should naturally fight to the last moment, but as a servant, I should fulfill my responsibilities to the very end."

Achilles gave a faint smile: "My time is running out. Anyway, you can defeat Tiamat, so I should fulfill my duty as a Servant... Even if I can't reciprocate her feelings, I shouldn't trample on her wishes."

Goodbye, everyone.

Summoning the damaged "Undying Chariot of Gale and Raging Storms," ​​Achilles transformed into a green meteor, streaking across the sky in a smooth arc before disappearing before the assembled heroes.

“It’s because of Master…” Cú Chulainn scratched his cheek, feeling that he should reflect on his actions, given his youth.

While Achilles was away, the spirits were not idle; they were besieging Tiamat.

However, even at her last gasp, Tiamat's body remained resilient, and nothing below A++ could inflict significant damage on her.

Here, only two characters possess EX-level Noble Phantasms: Charlemagne and Joan of Arc, with Joan of Arc's Noble Phantasm being a self-destruct Noble Phantasm.

Originally, there was also Sakata Ryoma, but Miss Ryoma had already left the scene due to time constraints, and Sakata Ryoma could only use his Noble Phantasm once.

Charlemagne was preparing to enhance his royal authority and maximize the power of his Noble Phantasm in order to defeat Tiamat, but he was stopped by Jeanne d'Arc.

"This time, please let me do it, Charlemagne."

Charlemagne and the saintess exchanged a glance, smiled, and then Charlemagne took a step back: "It's up to you, saintess."

Joan of Arc, her expression solemn, drew her sword, Saint Catherine. Her azure eyes were filled with compassion and tenderness. She knelt on the ground, intending to use her ultimate Noble Phantasm.

The Crimson Saintess is a conceptual weapon crystallized from her own mental landscape. Using the sword of Saint Catherine, which Joan of Arc never used in her lifetime, as a catalyst, she manifests the flames that once burned her. Using this Noble Phantasm will cost Joan of Arc her life. She will annihilate all existence at the cost of her own life.

This flame can only harm targets she deems necessary to destroy; it cannot be used against mere powerful enemies or when driven by emotions such as hatred.

This flame was a flame meant to save something, and at this moment, Joan of Arc, with a heart full of compassion and love, wanted to truly part ways with Tiamat.

Regardless, she was the original mother, and her love for her child was genuine. Even though she knew this was not her world and she hadn't sealed herself off, she almost never truly fought back.

Perhaps seeing this similar world and its people reminded her of her own child, causing her to empathize with them.

Joan of Arc did not want Tiamat to be destroyed through destruction; this was merely a farewell, a farewell between mother and child.

So, use a sword.

With the flames of salvation, let Tiamat be offered a farewell firework, ending everything.

Joan of Arc gripped the sword tightly with both hands, blood flowing down the silvery blade. She bowed her head slightly in a prayerful gesture, praying devoutly.

A warm and sacred light filled this corner, not dazzling or scorching, but giving a gentle feeling.

"The heavens are the glory of God, the skies are the work of God's hand—"

The clear chanting resounded throughout the Land of Shadows, even slowing Tiamat's final struggles, as if drawn by the gentle voice of the golden-haired saintess.

"...language is conveyed by day, and knowledge is transmitted by night."

They can neither talk nor speak, and their voices cannot be heard.

The warm light spreads across the earth and extends to the end of the world.

Climb upwards from the edge of the sky, all the way to the edge of the sky.

As Joan of Arc prayed fervently, the blazing red lotus flames surrounded her, even scorching her, yet Joan's expression remained sacred and serene.

"My destination is here, my destiny is here, my life is here."

My life is equivalent to nothingness, like a shadow wandering everywhere.

My bow is unreliable, and my sword cannot save me.

With this last remaining possession, I wish to protect his steps...

"...Lord, I entrust this body to Your disposal—"

The crimson flames that gradually ignited filled the entire world. The flames dispelled all the darkness and brought warm light, but they were not scorching, nor did they, like other people's ultimate moves, unleash a violent torrent of magic.

The crimson flame that burned Joan of Arc's life, ignited by her faith and soul, was not a flame of destruction, nor could it be driven by hatred; it was her compassion that was the source of purification.

"After despair comes hope!!!"

A beautiful and dazzling crimson flame, as bright as the sun, erupted and engulfed Tiamat.