The Kuzuryuu family became a major conglomerate shortly after the war.

At the time, Kuzuryuu’s great-grandfather was just an ordinary soldier in the Japanese military. While the troops were in full retreat and countless soldiers were bravely sacrificing themselves, he alone found his heart captivated—tainted—by the modern weapons wielded by foreign powers, entranced by their advanced, functional designs.

By contrast, how powerless Japan’s own arsenal was. The big-gun, battleship-centric doctrine that prized sheer ruggedness had no means of standing against the functional, modern weaponry of foreign powers. It was utterly useless and fragile, like breaking a baby’s arm.

He believed that this was one of the reasons Japan was in retreat.

While his fellow soldiers were sacrificing their lives for their homeland, charging forward and hurling themselves at the enemy in so-called kamikaze attacks, his great-grandfather alone raised a white flag and surrendered to the opposing nation.

The enemy soldiers, bristling with rage, were eager to torture him and execute him by firing squad in front of his comrades.

As he accepted that such a fate was unavoidable, he nevertheless remained captivated by the refined beauty of those machines.

The sleek, black fighter jets that broke the sound barrier as they soared in, gracefully wiping out friendly aircraft. The bombers that could annihilate everything in a single strike. The armored vehicles that darted lightly across the ground, and the many warships, both majestic and overwhelming.

Beautiful! Too beautiful!!

He was bewitched… his heart, mind, soul… if he were to be evaluated in this world, the most accurate description would be a weapons otaku.

His appearance was so grotesque and unsettling that the foreign soldiers, disturbed by the enemy defector who had become utterly bewitched by their own arsenal, decided to postpone his execution.

Despite being treated cruelly as a prisoner of war, he did not regret it at all. 

The joy of seeing advanced and functionally beautiful weapons up close had driven him mad.

And then, a turning point arrived in his life.

Some time later, others who shared his views appeared as well.

That became the first major step that would eventually propel the Kuzuryuu family into the powerful conglomerate it is today.

On that day, Kuzuryuu’s great-grandfather encountered his fate in the enemy nation.

He met the woman who would become the love of his life and the genius inventor later known as the matriarch of the Kuzuryuu family.

The pervert and the genius resonated with miraculous harmony—they drove each other on, berated each other, hated each other, and eventually fell in love.

They freely unleashed their passion upon the world and founded Kuzuryuu Heavy Industries Co., Ltd., which is now a major aircraft development company with a large market share.

Of course, at that time, the foreign forces wanted to monopolize the technical expertise she possessed. However, doing so would have meant making an enemy of the private armed force under her control. When they considered the risks, they knew it was something they had to avoid.

And so… that is the enormous—no, absurdly enormous—background behind the Kuzuryuu family. As for the eldest son of that lineage, Kuzuryuu Souma…

Spoiled and doted on since childhood, he became conceited and grew up as a self-centered person who embodies vanity.

He could obtain anything he wanted, and anything he didn’t want he could cast aside without the slightest hesitation.

To him, everything in this world was his personal property, and the idea that something might exist beyond his reach was simply unacceptable.

Yet, there is a woman who completely rejected a man like him.

Fuyunagi Shizuku.

To him, women were no different from replaceable toys. 

If he got bored, he threw them away. If he wanted them, he took them.

That was all they were.

And yet, that kind of lowly existence had the audacity to reject him.

A worthless, trivial nobody dared to refuse someone of his stature.

A nobody!!

Very well, he would make her understand.

He, the chosen, superior being, born blessed by the heavens, possessing everything in his grasp, would personally teach that insolent, insignificant woman her place.

“Nii-san.”

“W-What… Shiori…”

“Don’t grin so much. It’s gross…”

“Guh…”

Her name was Kuzuryuu Shiori.

She is Souma’s younger sister.

Unlike her Japanese-sounding name Shiori, she’s a natural blonde whose shining golden hair is her defining feature.

In stark contrast to Souma, whose Japanese blood runs strong, she inherited their great-grandmother’s side heavily, growing into a beautiful girl with strikingly foreign features.

Souma himself thinks his little sister is beautiful and cute and harbors a creepy siscon desire, wishing she would let him shower her with affection, but he receives a cold shoulder from his beloved sister herself… to the point that she might even hate him.

On top of that, perhaps because she inherited their great-grandmother’s intelligence, his sister skipped grades at fifteen and is already attending university, where she has submitted numerous papers and earned high praise.

She is a bona fide genius.

Souma may look good on the outside, but he does not have outstanding academic abilities. He has average academic skills for a high school student.

Unconsciously, he felt an inferiority complex from being compared to his sister and from being looked down upon by her.

(Tch, still as unbearable as ever.)

Muttering to himself, he left the living room.

She used to cling to him all the time when they were little, calling him “Nii-sama,” but now all she gives him are blatantly scornful looks. What a hopeless little sister.

Hmph, whatever.

Sooner or later, she’ll come crawling back to me, wagging her tail again. And when that time comes, I’ll make a fine toy out of her…

…But someone like her doesn’t matter right now.

The problem is Fuyunagi Shizuku… that nobody girl.

How should I educate that ignorant, sheltered fool who had the audacity to turn me down…? That is the question.