MTL - Dressed As a Grass - Chapter 57

The path of cultivation from scratch.Under the disguise of being a playboy.He is actually the boss behind the largest assassin organization——Misty Rain Tower.Aiming for the world!

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.

Five years ago, Violet Don was framed and accused of causing the death of Noah Bates's child. This led to Noah's sending her to prison and the downfall of her family. What he didn't know was that Violet was also carrying his child.Five years later, upon Violet's release, Noah corners her, demanding, “If you want your child, come and atone for your sins!”Violet smiles, “You can let him call anyone mom.”Noah, filled with hatred, says, “After five years in prison, how can you still be so cruel!”“Yes,” Violet's eyes redden as she smiles, “In your eyes, I'm a murderer.”Later, he finds out that he has owed her an apology all along. But by then, she no longer cares...

I am Master Siwei, and I speak for arcane arts.
This is an era of heroes and heroines.
This is an era of great changes.
In the end, it will be an arcane era opened by me.

- Description from Novelupdates