There are four kingdoms: the Diamond Kingdom, the Spade Kingdom, the Heart Kingdom, and the Clover Kingdom. It is in the latter where this story takes place.
In a city within the Common Realm of the Clover Kingdom sat a five-year-old girl with blonde hair and green eyes, staring at a church—her name was Mordred.
"I still can't believe it… I'm in Black Clover."
She had been in the Black Clover world for only two weeks. During the first week, she could barely get out of bed because after realizing she was Mordred, her fever came back, and she was bedridden again.
"I still don't understand how I ended up here."
When she finally managed to get up, she discovered she was in the Clover Kingdom, specifically in the city of Nairn, where Sister Theresa, the former teacher of Fuegoleon and Mereoleona, lived—and where, later in the manga, the child kidnapping incidents would occur.
She looked around and saw the other children playing, so she slowly started to move away, heading somewhere more private.
She walked through the streets of Nairn, watching people stroll and children play, but kept going until she saw a red-haired girl playing with a blonde one and another with black hair.
"Red hair… looks kind of familiar."
She thought for a moment but, unable to remember, continued walking.
She kept looking around the houses until she reached an area within the city filled with grass and a few trees.
"This place looks nice."
She went toward a tree and lay down beneath its shade to rest a bit.
"Black Clover… I can barely remember what happens. I should've rewatched it."
She looked up at the sky and focused for a moment. She could see different colors, which she now knew was…
"Mana."
Mana was the most important thing in the world—it was the source of all magical power used for spells. It existed in the environment and within people, constantly flowing.
Over time, she had learned that those colors she saw represented different magic attributes.
"Fire, wind, earth, water, electricity… That silver aura I saw near one of the kids must've been something related to metal, but…"
She focused for a moment and made an intense reddish aura appear.
"…I haven't seen anyone with this kind of magic. It looks different from fire magic or any I've seen before. What could it be? Mordred from Fate could use a red aura that grew stronger with hatred toward Arthur."
She tried her best to feel anger, to see if she could manifest her magic again, and suddenly an aggressive aura flared in her hand—like a flame ready to burn everything.
"That's not the right way to handle your magic."
She stopped using her magic and turned around, seeing an elderly woman with a kind smile.
"Excuse me, what did you say?"
"That's not how you should use your magic. Using magic through anger won't help you—it'll harm you in the long run."
When Mordred looked at the woman, she saw another kind of mana—dark, but with bluish tones.
"Have you not learned to use your magic yet?"
"No, so I was just trying something."
"You have a great amount of mana overflowing from your body, but you must learn to control it. Can you feel the mana of the environment and the people around you?"
"The different colors?"
"Yes, but that's only part of it. Close your eyes—I'll teach you how to better sense mana."
Mordred stared at her suspiciously. She didn't know her, and her request felt strange.
"Don't trust even your own shadow."
"What?"
"That I don't trust you. It's strange that you'd ask me to do that when I don't even know who you are."
"Fufufu… It's good that you're cautious. Allow me to introduce myself. I'm Vivian, guardian of the Grimoire Tower within the Common Realm."
"A guardian… I see. But what are you doing here?"
"I came to visit an old friend. Her name is Theresa Rapual."
"Sister Theresa?"
"Yes. Do you trust me now?"
"I think I can."
"Perfect. Now, close your eyes."
Mordred obeyed and closed her eyes—but then felt two hands on her face.
"What are you doing?"
"Making sure you can't peek. Can you see or feel anything?"
"Nothing at all."
"Focus on your breathing."
She obeyed again, relaxing a little and trying to feel something.
She tried for a while until she started hearing a sound.
'Is that… my heartbeat?'
A sensation began to flow from her heart—a fierce mana that surrounded her entire body.
"This… is amazing."
"That's your magic. To sense the world outside, you must first learn to feel what's inside."
"I see."
Vivian watched her for a moment, thinking.
"How about I train you to sense mana properly?"
"Really?!" said Mordred excitedly.
"Yes, but only when I visit Theresa—which is about once a week. If that's not a problem," Vivian said.
"I'd love to train with you!"
"Then come with me. I need to see Theresa."
Mordred stood up and followed Vivian toward the church, filled with excitement at the thought of becoming stronger and enjoying her new life.
--
--
Night had fallen, and all the children at the church were supposed to return, but Mordred was nowhere to be found—she had kept exploring after Vivian left.
"Hey, calm down. You've had too much," said a man holding onto another who was clearly drunk.
"I'm fine, I'm fine," said the drunk man, trying to stand straight.
"I don't get why you drink so much."
Mordred was hiding behind some barrels, listening to the men talk while she trained to sense mana without using her sight.
"It's those damn nobles. They think they're better than us and treat us like garbage! Can you believe when I went to sell the wheat, they only wanted to pay a fraction of its worth?" said the drunk angrily.
"I know, but there's nothing we can do. Nothing," replied the other man.
"This wouldn't be happening if that idiot hadn't died!" shouted the drunk, shoving his friend.
"Shut up! You know we can't talk about that. What if a noble hears you?"
Mordred stopped focusing on her training and instead listened carefully to their conversation.
'If that bastard hadn't died? Why do I feel like I'm hearing something I shouldn't?'
She tried to leave, but accidentally hit one of the barrels, alerting the men.
"Damn it! Let's get out of here," said the sober man, dragging his drunk friend away.
"If that stupid king hadn't died, things would be so much better," mumbled the drunk. "That idiot…"
Mordred couldn't hear the rest—it was almost a whisper.
"Stupid king?"
Then, she felt a fire-type mana approaching.
"Crap. It's really late—I have to get back before Sister Theresa finds me."
Mordred ran back toward the church, hoping to make it before Sister Theresa caught her and gave her a scolding.