Chapter 5

＝Demon King's Perspective＝

It has already been ten years since I began the boy's training.

The boy, who initially had no foundation in magic, has managed to grow into a novice magician thanks to my rigorous training.

I thought it would take much longer, but he grew at a speed that exceeded my expectations.

This is not because he had any talent...

As I had predicted, he had not a shred of magical talent.

However, he had a desire for power that more than made up for it.

Thanks to that overwhelming desire, which could be considered madness, he was able to endure my demonic training.

At first, I took him on as a disciple just to pass the time, not expecting much. But perhaps this child might turn out to be something special...

Hehe, things are getting a bit interesting.

◇

―――A hundred years after the training began.

"Superior Fire!!"

The superior magic released by Louis hit the ground, creating a massive pillar of fire.

Hmm, well-cast magic with well-refined mana.

"Mr. Testarossa!! How was that!?"

Louis, panting, ran over to me. He's still as cute as a small animal.

"Excellent, Louis. But I told you not to call me Mr. Testarossa, right? What should you call me?"

"U, um, e, er... s, sister..."

"......!!"

Sister.

The moment I heard that sweet word, a jolt ran through my lower abdomen.

It was around the 13th year of his training that I started having Louis call me "sister."

While tending to him as he was exhausted from training, he accidentally called me "sister" due to fatigue.

At that moment, the maternal, or rather, sisterly instincts that had been sealed away for thousands of years in this space exploded.

Since then, Louis has become like a dear little brother to me.

When the Dragon King saw me clinging to Louis, he looked at me in disbelief, but I don't care.

I live as I please.

I have decided to live for Louis, who taught me what 'love' is for the first time.

Leave it to your big sister. I will definitely return you to your original world.

Even if it means eternal separation...

◇

"Dark Flame!!"

The black flames released by Louis hit the ground, burning everything in sight with the fires of hell.

I can honestly say it's impressive.

To grow this much in just three hundred years of training...

This is the power of 'love,' isn't it?

"Did you see, Tes-sis!?"

"Yes, I saw. It was a magnificent dark magic."

Saying this, I stroked Louis's small head as he ran over to me.

I am deeply moved that he has managed to keep up with my training with such a small body.

The magic Louis used just now is a higher-level magic, 'Dark Magic,' which is above the basic 'Five-Color Magic' commonly used by humans.

A special magic that only a select few elite among the demon race can use, Louis has mastered it beautifully.

"Really... really, well done..."

The days we spent together here flash through my mind.

It was never smooth sailing. It was a difficult and painful training period.

But strangely, it was fun.

I never imagined that my days here would become so enjoyable until Louis arrived.

But those fun days are about to... end.

"Tes-sis...?"

Louis, looking at my face, shows a puzzled expression.

What's wrong with me?

"Are you crying...?"

"Huh...?"

Without realizing it, a single tear had rolled down my cheek.

I haven't shed tears since I was born...

"Hehe, who would have thought that I, the most feared Demon King, would be brought to tears by a boy like you?"

"Wh-What!? Is it my fault!?"

"Yes. Reflect on it."

"At least tell me why!"

"No. You figure it out."

As usual, we repeat our pointless conversations.

To forget the approaching farewell, even if only for now.

〈Character File〉

Testarossa S. Harlequin Nodens

〈Race〉Demon Chaos Bloodline

〈Title〉Demon King

〈Age〉17 (Youngest Demon King in history)

〈Skills〉Ultimate Magic, Dark Magic, [Secret], Ki Gong 1st Dan

〈Abilities〉Mana: SSS, Ki Gong: A, Strength: S, Intelligence: SS, Sisterliness: SSSS

She participated in the Demon King selection tournament held when she was 14, and despite receiving no attention, she defeated the strong competitors with her overwhelming mana and magical skills to become the "Demon King."

In fact, it was her friend who entered her without her knowledge, and she herself had no desire to become the Demon King.

However, with her inability to refuse requests, she fulfilled the duties of the Demon King with her innate charisma and knowledge, achieving them perfectly one after another. Combined with her natural beauty, she gained the highest support rate in history, and the demon race rapidly developed.

When it was reported that she had been defeated by a hero, the Demon King's capital is said to have echoed with the cries of those mourning the Demon King's death for seven days without ceasing.