The Reincarnated Assassin is a Genius Swordsman - Chapter 5

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.

“Young man… if you could go back in time, what period would you like to be in?”

Good news: You’ve transmigrated as a born protagonist , your confidants have exceptional talents, boasting abilities like Heart Voice, Simulator, Rebirth... and many other top-tier skills. What you only need to do is to wait for one of them to grow up, then you will be invincible to ascend. Bad news: They’re all yandere !!! Under the gaze of yandere, Xu Yuan shivered in fear. It was not until he was about to be attacked with a firewood cleaver. “If that’s the case, then I’m dropping the act—I am none other than the Great Love Immortal Venerable!”

Seven years ago, she freely and easily abandoned ￥100 and ran away, carrying her unborn son with her. Seven years later, she returned with the lady killer’s genius son, never expecting that her darling son would sell her out to MBS International. Unexpectedly, her immediate superior was the Mr. ￥100 from seven years ago!