Ash Ketchum opened his eyes, feeling a strange warmth in his chest. The last thing he remembered was standing with Pikachu in Pallet Town, looking forward to new adventures. But now, he found himself in an unfamiliar place, surrounded by advanced technology and strange symbols etched into the floor and walls.

A voice broke his trance, "Welcome to Chaldea, Ash Ketchum."

Ash turned to see a young woman with long white hair and piercing golden-amber eyes, dressed in a formal yet practical outfit. She carried an air of authority and confidence.

"Where am I?" Ash asked, still trying to process everything.

The woman smiled slightly. "You are in the Chaldea Security Organization, a place dedicated to preserving human history. I am Director Olga Marie Animusphere."

Ash blinked. "Chaldea? Human history? What's going on?"

Olga Marie sighed, her expression softening slightly. "You've been chosen as a potential candidate to be a mage for Chaldea. It's a long story, but we need people with strong wills and unique abilities. And from what I've heard about your adventures, you fit the bill."

Ash frowned, "But I'm just a Pokémon Trainer. How can I help?"

"What in the world is a Pokémon Trainer, rookie?" the Director asked with a deep frown.

"Wait..you don't know what a Pokémon Trainer is?" Ash stared at Olga incredulously.

Before Olga Marie could respond, alarms blared throughout the facility. Panic spread as staff members rushed around, trying to make sense of the chaos.

"We're under attack!" a voice shouted over the intercom. "All hands to battle stations!"

Olga Marie's eyes widened in shock and fear. "This can't be happening. Not now!"

"Uhh...what's going on?" Ash was completely lost in what was happening.

She turned to Ash, her expression deadly serious. "Ash, follow me. We need to get to the summoning chamber."

Ash nodded, determination replacing his confusion. He followed Olga Marie through the maze-like corridors of Chaldea, his heart pounding in his chest. They finally reached a large room filled with intricate machinery and a massive summoning circle in the center.

"Stand there," Olga Marie instructed, pointing to the circle. "Focus on your strongest feelings and call out to a hero from history. We need a Servant to defend Chaldea."

"Wait, what? A Hero? Servant?"

"Just do what I say, rookie!" Olga Marie barked, her patience growing thin.

"Fine..." Ash took a deep breath, stepping into the circle. He closed his eyes, thinking of all his friends, his adventures, and his unyielding desire to protect those he cared about. "Come forth, Servant!" he shouted, his voice echoing through the chamber.

A brilliant light filled the room, and when it faded, a figure stood before him. Ash's eyes widened in surprise. The Servant was a tall, imposing figure clad in silver armor, wielding a massive sword.

"Who summoned me?" the Servant demanded, his voice booming.

Olga Marie's jaw dropped. "That's…that's King Arthur!"

The Servant turned to Ash, his eyes piercing. "Are you my Master?"

Ash blinked but slowly nodded, still in shock. "I…I guess I am. I'm Ash Ketchum."

King Arthur knelt before Ash, a sign of respect. "Then I shall fight by your side, Master."

Before they could say more, the room shook violently. An explosion rocked the facility, and Olga Marie stumbled, her expression one of fear and determination.

"We have no time to lose," she said. "King Arthur, we need your help to repel the attackers."

King Arthur rose to his feet, his sword glowing with a fierce light. "Lead the way."

They rushed out of the summoning chamber, Ash and Olga Marie following closely behind King Arthur. The hallways were filled with chaos, but King Arthur's presence seemed to bolster the morale of the Chaldea staff.

As they fought their way through the facility, Ash couldn't help but marvel at the power and grace of King Arthur. He fought with a skill and precision that was awe-inspiring, cutting down enemies with ease.

Finally, they reached the control room, where the source of the attack was revealed: a dark, ominous figure shrouded in shadows.

Olga Marie's eyes narrowed. "That's the enemy. We need to stop them here and now."

Ash stepped forward, his fists clenched. "We won't let you destroy Chaldea!"

The dark figure laughed, a chilling sound that sent shivers down Ash's spine. "You think you can stop me, boy? You're just a child."

King Arthur stepped forward, his sword raised. "He is more than a child. He is my Master, and together we will defeat you."

The battle that followed was fierce and intense. King Arthur and the dark figure clashed, their powers shaking the very foundation of Chaldea. Ash watched in awe, his heart pounding with every strike.

Finally, with a final, powerful blow, King Arthur defeated the dark figure, who dissolved into shadows with a scream of rage.

The room fell silent, the only sound was the heavy breathing of Ash, Olga Marie, and King Arthur.

Olga Marie turned to Ash, a look of genuine respect in her eyes. "You did it, Ash. You saved Chaldea."

Ash smiled, feeling a sense of accomplishment and pride. "I couldn't have done it without Arthur."

King Arthur nodded, a small smile on his lips. "You have a strong heart, Master. I am honored to fight by your side."

The next day, Chaldea was a hive of activity as the staff worked tirelessly to repair the damage from the recent attack. The corridors buzzed with the hum of machinery and the chatter of technicians. Despite the chaos, there was a sense of resilience and determination in the air.

Ash walked through the bustling hallways with Director Olga Marie and his newly summoned Servant, Proto Arthur, by his side. The young Pokémon Trainer turned potential mage was still trying to adjust to his new surroundings and the gravity of his role.

"Today, I want to introduce you to two important members of our team," Olga Marie said, her tone brisk and businesslike. "They've been with us for some time and will be crucial in our operations moving forward."

Ash nodded, eager to meet more of his new allies. They soon arrived at a spacious meeting room where two individuals were waiting. One was a young man with a relaxed demeanor and messy brown hair, while the other was a young woman with short lavender hair and glasses, wearing a suit of white armor with a massive shield strapped to her back.

Olga Marie's expression soured slightly as she addressed the young man. "Ritsuka Fujimaru, our supposed top Master candidate," she said, her voice dripping with sarcasm. "If only you could apply as much effort to your duties as you do to napping during my lectures."

Ritsuka winced at the jab, rubbing the back of his neck sheepishly. "I promise I'm working on that, Director…"

The young woman beside him smiled apologetically. "Please excuse him, Director. Senpai means well."

Olga Marie huffed, then turned to Ash and Proto Arthur. "Ash, Arthur, meet Ritsuka Fujimaru and Mashu Kyrielight. Despite his… shortcomings, Ritsuka has proven himself capable in many missions. And Mashu is a dedicated and skilled Demi-Servant."

Ritsuka stepped forward, extending a hand to Ash. "It's nice to meet you, Ash. I've heard about what you did during the attack. You and Arthur were incredible."

Ash shook his hand with a grin. "Thanks, Ritsuka. I'm still getting used to all of this, but I'm ready to do my best."

Proto Arthur bowed slightly, a respectful gesture. "It is an honor to meet you both. We look forward to working alongside you."

Mashu's eyes sparkled with enthusiasm. "I'm Mashu Kyrielight. I hope we can become good friends and support each other in our missions. We're all in this together, after all."

Olga Marie crossed her arms, her gaze still on Ritsuka. "Just remember, Ritsuka, that we expect you to be fully prepared and focused. No more sleeping through important meetings."

Ritsuka sighed but nodded. "Understood, Director. I'll make sure to be more attentive."

Ash couldn't help but feel a little sympathy for Ritsuka. He seemed like a genuinely nice guy who was trying his best, even if he had a few rough edges. "I'm sure we'll all get along fine," Ash said, trying to lighten the mood. "We're here to help each other, right?"

Mashu smiled warmly. "Exactly. We're a team now."

Proto Arthur's expression softened as he looked at the group. "I'm looking forward to it."