MTL - Reincarnation of Master Su - Chapter 18

Sold by her own grandmother to become a shared wife to the poverty-stricken Ye brothers for twenty taels of silver, Liu Duo, unwilling to succumb to her fate, escaped in the night. She slipped and fell and died an inexplicable death.

Then She, a soul who shared her name, reincarnated into her body. Could this be heaven trying to make amends? She is going to has four husbands? Since what’s done is done, She might as well accept her new life!

Work hard, earn money, get richer, become wealthy, maybe even have some kids! Just as they are living their lives, an array of crazy characters just loves to disrupt their peace. Are they here to taunt her? Take advantage of her? Well, good luck with that! I’m not some sick cat who can’t fight back!

- Description from Novelupdates

Li Wensheng transmigrated to an era where all energies were returning and every citizen practiced martial arts.Here, champions focus on martial arts mastery, becoming physically peerless as they honed their spirit. They would also seek superior weapons, including unbreakable war axes, or keen blades that could cut a giant tree with a single swing.Even so, Li Wensheng learned Immortal Arts from the very start! Though his scrawny form was exceedingly inconspicuous at first, he wielded Immortal Arts to smash long blades with his bare hands and crush giant hammers!Li Wensheng was flying everywhere on his sword while others were busy trying to surpass the limits of human speed. He could kill with a leaf or flower he plucked while others requested blacksmiths to hone their weapons. He cooked medicinal pellets with his cauldron, brewing Yuan Pellets that ascend cultivation while others trained their bodies to strengthen themselves.Martial arts champions: “Why aren’t you using any weapons?”Li Wensheng smiled, two of his fingers casting an immortal technique: Ten Thousand Swords Retrogression!At his words, every sword behind everyone’s back took to the skies without hope of control, gathering behind Li Wensheng into a rain of swords that covered the skies!This is a world where I alone cultivate immortality while everyone else trains in martial arts!

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.