The Water Swordsman Along With a Blue Lion!

Rin: "I am Rin, a Swordsman of the Sword of Logos. I've come for you—Flame Swordsman."

Everyone: "HUH!?"

Artoria: "A swordsman?"

Rin: "Exactly. You've been chosen by the Sacred Sword, Rekka. It means you're destined to wield the flames and carry the title of Kamen Rider Saber."

Artoria instinctively summoned Rekka, holding the burning blade in her hand. Her eyes drifted toward Rin's own sacred weapon—radiant and rippling like water.

Rin: "Come with me on a mission."

Artoria: "A mission? What kind? Are you sure you want me along, I'm still pretty new to this."

Rin: "That's why I'm here to act as your guide. I was sent to monitor you and help you grow as Kamen Rider Saber."

The room remained frozen, Rias and the rest staring at the mysterious new girl.

Rias: "Hold it. You can't just barge in like this. We were in the middle of something important."

Rin: "I understand, Miss Gremory, but this can't wait. What I'm dealing with is far beyond your jurisdiction. This is Sword of Logos business."

Rias: "Mind explaining a bit more? You are in my territory after all."

Rin: "And I respect that. But what's coming threatens more than just devils and angels. We don't have much time. This is something that only the sword of Logos can handle."

Rin takes out a brown Wonder Ride book.

BOOK GATE!

The book morphs into a door with a bright white light pouring out of it.

Rin: "Artoria, if you would please."

She motioned for the blonde to follow.

Rin: "It's time to bring you to the Northern base. There's someone who wants to meet you."

Rin walks through the door leaving Artoria and everyone else stunned.

Morgan: "What are you waiting for? Go ahead and handle your business."

Rias: "N-now hold on a second!"

Morgan: "Relax dear cousin. Let her go."

Rias: "Sigh, Okay then, you can explain the rest to her later then."

Morgan: "I'll handle it. Artoria you can go, I'll meet up with you later."

Morgan waved for Artoria to go follow Rin.

Artoria: "Okay, I'll see you guys later!"

Artoria goes through the door, it closes behind and shrinks into nothing.

Issei: "No fair, how come she gets to go do all the cool stuff!"

{Northern Base — Sword of Logos}

Artoria: "Wow..."

The Northern Base stretched out before her, a strange machine, a fusion of ancient architecture and futuristic tech. In the center stood a strange table-like device, humming with magical energy.

Artoria: "This is... incredible!" She eagerly approached the strange contraption, poking buttons and panels.

Rin: grabbing her arm "Please don't touch that. I know it's exciting, but this stuff is delicate."

At the top of a long staircase, a door slid open. A graceful woman stepped forward, robes flowing behind her as she looked down from the balcony.

Sophia: "I am Sophia. I serve as the guardian of the Sword of Logos."

Sophia: "This Northern base is located in the North Pole."

Artoria: "The North Pole...?"

A cartoon thought bubble popped over her head: Santa flying over the base in his sleigh.

Rin (deadpan, swiping the air): "No, Santa isn't here."

Sophia: "We operate from this location with the sacred swordsmen, defending the Book of Creation—the source of this world. Our mission is to maintain balance and protect its power."

Rin looked at Sophia, who gave her a nod of approval.

Sophia: "That sword you carry, Rekka, chose you. You are now a Kamen Rider."

Rin glanced from Artoria up to Sophia.

Rin: "Is it alright to tell her?" Sophia nods with a smile.

Sophia: "That Sacred Sword has deemed you worthy of becoming a Kamen Rider."

Artoria takes out her Seiken Swordriver and looks at it.

Artoria: "A Kamen Rider?"

Rin: "Yes. Swordsmen chosen by the Sacred Swords go by that name."

Artoria: "What should I do now?" She looked up at Sophia.

Sophia: "This is a battle that started long ago and will continue into the future without end. What you should do can only be dictated by your heart."

The book case behind Sophia opens back up, she turns and walks inside with the case closing behind her.

Artoria: "So, what was this mission you were talking about?"

She paused before drawing her own Seiken Swordriver.

Rin: "A traitor known as Calibur, along with creatures called the Megid, are behind this. Eleven years ago, they stole countless Wonder Ride Books. Many swordsmen died trying to stop them."

Rin: "We fight with our lives on the line to stop them. To protect the balance between the real world and the world of stories."

She looked Artoria straight in the eye.

Rin: "Will you fight with me?"

Artoria: "Of course, I can't sit by and just watch people get hurt."

Rin smiles at the blonde's words and pats her shoulder.

Rin: "Let's go then, we have a city to save."

She hands Artoria a Wonder Ride Book.

Diagospeedy!

Rin: "Take this, it's a Ride Book only you can use."

Artoria takes it into her hand.

Artoria: "Thank you, I'll make sure to take care of it."

Rin: "Let's leave now. We have some work to do."