MTL - Can You Connect to Your Wifi? - Chapter 55 .WIFI signal

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.

It begins on the mountain.

With the glint of a knife, a flash of steel in the hands of a sworn brother. A betrayal.

Stabbed and pushed down the mountain, Zi Chen lied within the red-stained snow, left to die.

This is where it begins; he is given life by lightning,
baptized by thunder.

Those who had once betrayed him should all suffer in his cruel revenge.

- Description from Novelupdates

His whole life turned into a joke, when Leonardo Thawyne the proud son of Duke William Thawyne, came to know that he was not the real son but a swapped kid. And now to save his inheritance he would have to marry the real heiress.

Evangeline Rossador, a simple music teacher from a town, was content with teaching music to kids and having a garden in her home. But her whole life turned upside down when she was announced as betrothed to infamous cruel duke Leonardo as her father's last wish before dying.

They both were hardly accepting the fact that they were bound in a forced marriage when life played another game and she found herself standing in front of her died father.

Soon more deaths started to occur and they both find themselves standing in mid of many misunderstandings and conflicts.

How would this chaos be solved? And would they be able to find love in this politically enforced marriage?

“I asked what were you doing there?” she glared back at the roaring man who was trying to show his rights to her.

“I was dancing with the Earl Nickolas,” she replied, looking back in his eyes.

“Theodore go and bring the fingers of Earl who has dared to touch what is mine.” came the reply with an evil smirk.

“Now tell me, my dear wife,” he whispered as he came close to her, “which part of your body have he actually touched?

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.