Villainous Lady in Egg:-

　A girl standing in front of me.

　The girl has beautiful, lustrous black hair that reaches down to her waist, and large, bright purple eyes, and although she is still young, she exudes a bewitching aura.

"Let's go, Arc."

　She calls out to me.

"...Yeah, Big Sister."

　To that, I replied a little late.

　The reason why he was late in saying his next words was because he was not very familiar with his own name, "Arc."

　There's a reason why you're not used to it.

　I have memories of my past life in which I lived as "Arima Yuto" up until I was a high school student.

　That's why I'm still not used to the name of this world.

"Haa!"

　And so my big sister in this life closed the distance between us and brandished her clenched fist.

"Phew."

　I block that fist.

　My older sister swung her fist at me, her younger brother, but this is not domestic violence.

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　The world I was reincarnated into is a feudal society with a level of civilization somewhere between the Middle Ages and the early modern period, where swords and magic are widespread as military power, a typical fantasy worldview often seen in games and light novels.

　My sister and I were born as siblings to the Margrave in this world.

　We have a duty of noblesse oblige: the obligation to possess arms and protect the people.

　In this world, where monsters exist, a unique and powerful enemy of humanity, it is the duty of nobles to learn swordsmanship and magic and gain strength, and our current activities are part of that duty.

"S..e...i!"

　I dodged my sister's fist, which was swung as part of close combat training, and counterattacked by slamming my palm into her stomach.

"Ugh."

　After receiving the palm strike, the older sister lets out a cry of agony as she lifts her body slightly.

"say∠( ˙-˙ )／"

　I aimed my sister's face and kicked her.

"Kyaa?!"

"(ﾉ´･ω･)ﾉ Hey there."

　He grabs his sister, who has been kicked and is staggering, and throws her.

"...Ugh."

　As she rolls on the ground, my older sister gives me a strong look.

"You're my younger brother... why are you like this?"

"Heh heh!"

　As you can see from this series of events, in terms of power I am stronger than my sister.

　My sister is 10 years old. That's older than me, who is 8 years old now, but things change when you think about my past life.

　Besides, he knows quite a lot about this world.

　This is because this world is very similar to the game "Canary's Miniature Garden" that I played in my previous life.

　He was also fully aware of the existence of Arch Reinhard, the being into whom he had been reincarnated.

　In this life, I, Ark, was a character who seemed destined to be executed after getting caught up in the affairs of my older sister, Liese Reinhard, who had fallen into darkness and become a villainous lady.

"...Ugh, my dignity as an older sister."

　My sister is groaning in frustration in front of me.

　In other words, the future villain, Liese Reinhard, was the girl standing in front of him.

"I don't want to be executed..."

"Huh?"

"Nothing."

　My sister's fall into darkness.

　If I don't prevent that, I'll be executed.

　In my previous life, in the stories about villainous nobles that I read on novel posting sites, the execution route could often be avoided by changing one's own movements, but in my case, the execution route cannot be avoided unless the movements of others are changed.

　Even if they escape, the family will likely be torn apart.

　I would like to avoid that too if possible.

"Okay, let's do it again?"

"Yeah... I'll do it."

　My sister nodded at my words and stood up.

"...I will obtain the power to take revenge on those who killed my mother."

　What is reflected in my sister's eyes is a dark, murky light.

"Hmm..."

　Preventing my sister from falling into darkness.

　That was my immediate goal in this life.