Isekai Maou to Shoukan Shoujo Dorei Majutsu - Volume 1 Prologue

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.

After waking up in the body of the Young Master of the Luo family, he finds he has the knowledge of hundreds of games and Light Novels. However, he finds his Dantian is crippled, so he can’t practice cultivation! Luckily, he has the Upgrade system.

Li Quangqing traversed to the cultivation world and became a family fisherman, starting with twenty acres of fish ponds.Unexpectedly, every time spiritual fish were harvested, a reward orb could be obtained.[Harvested one adult big green fish, received a lower-grade water arrow talisman!][Harvested one adult iron bone crab, received the “Gengjin Sword Technique”!][Harvested one adult longevity turtle, received the “Gui Sui Shou” pill, prolonging life by twenty years!]...Since then, Li Quangqing watched the tides rise and fall in the world, the wind and clouds changing, wanting only to raise fish and become immortal peacefully.Until thousands of years later, a certain Water Virtue True Immortal appeared out of nowhere, shaking the immortal realm, capable of covering the sky with one hand.“Since the Milky Way is also a river, it's okay for me to use it for fish farming, right?”

An entomologist’s soul transmigrates into a cultivation world, inhabiting the body of a small, obscure cultivator who specializes in insect manipulation. Reborn, he desires only to avoid conflict and quietly develop in a mortal village.Inspired by the “Sun-Moon Heart Sutra,” he creates his own “Ten Absolute Scripture.” Inspired by the “Nine Deaths Divine Art,” he devises the “Purgatory True Demon Technique.” Moved by the “Eternal Life Sutra.” he extrapolates it into a hundred layers.With boundless creativity, extraordinary insight, and unlimited time, he pioneers new techniques, pill formulas, artifact designs, array formations, gu recipes, poison concoctions, and brewing methods—all entirely of his own invention.While others cultivate paths of slaughter, he alone forges and cultivates the path of self creation.