Chapter 1

"Leila! I’m breaking our engagement!"

"Huh?"

I thought I had been summoned by my fiancé, Prince Oswald the Second, but the first thing he said to me was this. Oswald had a somewhat childish personality for his age. I don’t want to say bad things about my fiancé, but to put it bluntly, he was spoiled.

Perhaps because his excellent older brother had easily ascended to the throne, there were no factions fighting over the line of succession in this generation. As a result, no one had any expectations that the second prince, Oswald, might become king, and he was simply pampered.

He skipped his studies, avoided training, and had many food preferences. He had been spoiled since he was a child. Since I was introduced as his fiancée at the age of seven, I had seen all of this up close.

"Oswald, what are you saying?"

"I’ve had enough of a woman with no charm like you! You’re always nagging!"

I do nag a lot. I can see that.

I was rigorously educated to be a suitable fiancée for the royal family. Academics, etiquette, music, dance, and even combat training to protect him in emergencies—my education was truly comprehensive. I was not allowed to show any weakness or cry.

All of this was for Oswald. Even though he was spoiled, he was still royalty. He could be used as a source of conflict with other countries. It was my duty as his fiancée to watch over him and prevent him from making mistakes—this is what my parents had always taught me.

Because of his excellent older brother, Oswald had his own struggles. I thought he skipped his studies and acted spoiled to get attention and be noticed.

(I’m watching over you. So it’s okay.)

I nagged him a lot to prove this. Anyone could charm him with a smile, but only I could truly support him.

I thought he understood and accepted this as a given.

Perhaps it was twisted, but I believed our hearts were connected. I believed this.

...But it seems it was just my own delusion.

"I have enough money to live a life of leisure! I don’t need to study or learn etiquette! You just need to be charming to me!"

Oswald doesn’t care about his inferiority complex towards his brother or the lack of expectations from others. He just wants to avoid unpleasant things and live an easy life. This is clear to me now.

The foundation that had supported me is crumbling with a loud noise. Shocked, I stagger slightly, feeling a bit dizzy.

"...Oswald, calm down. If you break our engagement, it will strain the relationship between the Duke’s family and the royal family."

The long-standing misunderstanding is revealed, and my feelings for him are cooling. However, as a duke’s daughter, I whisper to myself that I cannot break the engagement based on personal feelings. The royal family and the dukes are closely tied, and they deepen their relationships by marrying their children to ensure long-term stability for the country.

Therefore, breaking the engagement would be like tarnishing the reputation of both families.

"That’s not a problem. I’ll marry your sister, Sophina!"

"...What?"

"Sophina is charming and doesn’t nag! She’s also cuter than you!"

My sister, Sophina, is a lovely girl who fits the description of being innocent and cheerful. Her appearance and adorable smile make her popular with men.

---However, I know her true nature.

She is interested in everything I do and wants the same things.

---I want to be like my big sister.

She used to say such things innocently. I told her to stop, but our parents gave her whatever she wanted.

You want to marry her?

No way!

If you do that...

"Marrying Sophina will strengthen the bond with the Duke’s family! It will improve the relationship even more!"

"Oswald... Please, don’t do that."

I extend my trembling hand and plead desperately. Sensing my anxiety, Oswald’s smile deepens.

"Hmph. It’s too late for you to understand your position now! Sophina, come in!"

The door behind Oswald, which was slightly open, creaks as someone enters.

"Sophina... You’re back."

My sister, who had been away for a while for magic training. I knew she would be back soon...

"..."

My sister is wearing her usual frilly dress. She has no smile on her face and approaches step by step with her head down.

"As you heard, Sophina! I’m breaking my engagement with this woman and marrying you!"

"..."

"I’ve heard about your bad relationship with her! How does it feel to take a man from your sister?"

"..."

Sophina stands beside Oswald without saying a word.

"Do you understand what it means that I chose you? You are superior to her in every way—"

Just as the elated Oswald was about to put his arm around Sophina’s shoulder, she grabbed his wrist and looked up.

"Huh?"

Oswald lets out a foolish sound. Sophina’s face is not the charming one she is known for, but rather a demonic expression.

"---Die."

"Wha!?"

Sophina smoothly strikes Oswald’s jaw. It’s a stunning blow, using her entire body’s strength.

She closes the distance with the flying Oswald, grabs his collar, and glares at him.

"You... What did you just say?"

"Ah! What’s wrong, Sophina?!"

"Ah... I did it."

My sister is enraged. Oswald is terrified. And I look up to the sky.

"Answer the question."

The true nature of Sophina, known only to me.

"---What did you say about my beloved big sister?"

---Anyone who speaks ill of my big sister is my enemy.

My sister is an extreme big sister’s fan.

If you think "This is the sister’s revenge!" please bookmark and give it ★★★★★.

First chapter of the comic adaptation included.