From Overlord To Multiverse. - Chapter 21: Labrinth.

When The Cute Kunoichis Spied on Their Teacher's Secret is a light novel written by Kazuma Kamachi and illustrated by Ryuushi Tajima.

The story takes place in a world where Japan never ended their isolationist phase, and agents from foreign powers are always threatening to steal the country's advanced technology. In order to combat this threat there has been a resurgence of ninjas that use Strategic Martial Arts, techniques that combine cutting-edge modern technology with a traditional foundation of martial arts and ninjutsu. The story follows Souha Sugiyado, a 17-year old ninja instructor and former ninja prodigy who was forced to retire from active duty by the wounds he suffered in his last mission. Souha's four students are all kunoichi who have all gained the rank of Elite Ninja, the highest official rank available to ninja. However, one day two Shogunate ninja approach him with the news that his four students have gone rogue and have stolen a portable modular nuclear reactor, and thus they ask for his help in bringing his students to justice.

Being able to learn any skill immediately, and just by raising its proficiency, stand at the summit.

He is the World Chef Association Honorary Chairman, having the title of the World Chef God.

He is the greatest composer, pianist, and conductor after Beethoven and Mozart.

He also has the title of Underground Racing King, Fist King, Gambling King, Giant of the Stock Exchange Market, Arm of the Industries and King of the Skies.

He who has a miraculous learning ability and can stand at the apex of all things if he so wishes for it, the Omni Genius.

- Description from Novelupdates

Qin Yu had lost both her parents when she was young and was all alone. Since then, she lived with her father’s comrade-in-arms.

Due to the huge inheritance that her father had left behind, her foster mother had attempted to murder her repeatedly. In order to survive, she could only pretend to be a mentally disabled child.

It wasn’t easy for her to reach adulthood, yet her foster mom wanted to marry her off to a powerful and influential family.

She heard that her fiancé was blind and had a violent personality.

However, no matter how ruthless he was, was he as ruthless as her foster mom?

In order to escape from this terrifying family, she decisively agreed to marry that person in her sister’s place.

Soon, news of a fool marrying a blind man spread like wildfire.

Their marriage had become the hottest laughing stock locally.

However, after she married him, she realized that everything was not what the rumors said.

Her husband was not blind at all, and he was not cruel. He was gentle and refined, and he treated her like a treasure.

And she wasn’t mentally deranged. She’d only pretended to be a fool to flee from her foster mom’s attempted murders.

What surprised her, even more, was that she had known her husband for a long time. A long time ago, they had been best friends online.

It was no wonder that her husband was as cold as ice to all women, lying that he was blind and unapproachable. But in front of her, he was as gentle as a lamb and did not hide anything.

After Song Juyao died and emerged from the virtual world, she learned that her entire life had just been a reality show which was led and controlled by others.

One billion viewers watched this live broadcast, all of them pointing fingers at her and ridiculing her life whilst the director team thought up every possible method to design setbacks for her, pulling her into the mud over and over again.

Then, Song Juyao was reborn. This time, her memory was not suppressed.

This was a crazy world. People were discontent and bored of their lives. They had also lost their enthusiasm for various kinds of entertainment, falling to the point of seeking all sorts of thrills in order to arouse their emotions.

Later, they found a precious treasure. She was perfect. They held her in the palm of their hands and went wild for her. They even regarded her as a God and worshipped her fanatically.

- Description from Novelupdates