Medical Sovereign - Chapter 542 - The Interception

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.

A 30-year-old NEET is reincarnated into the body of an otaku that choked to death on instant noodles. As he comes to grips with his new life, he realizes that this world is subtly different from Earth. The denizens of this world are far better looking, and this new world also possesses futuristic technology as well as mysterious Yin Yang masters!

After reincarnating, he realized that he was endowed with a miraculous game-like system, which enables him to increase his own stats and transcend the limits of the human body. This system even has a game-breaking ability to save and load in real life!

In this new world that’s akin to a 2-D game, he just wants to enjoy life and head for a glorious future… However, he is quickly embroiled in a complex plot. Can he unlock his true potential and utilize his system to break the shackles that confine him and discover the truth about his previous body’s circumstances?

- Description from novelupdates

This book, alternatively titled “The Heavenly Court of Great Qin,” unfolds the tale of Qin Jun, who finds himself transported to a realm where he assumes the role of a demoted prince. Despite the challenging circumstances, destiny has more in store for Qin Jun than despair—enter the Mythology System!Under this system's influence, any character from mythology can be summoned into existence - The awe-inspiring might of the Supreme Heaven Great Sage, Sun Wukong, capable of shaking mountains and rivers with a single strike of his staff; The Thousand-Mile Eye and Favorable Wind Ears, acquiring profound perception of everything in the world.The Tathāgata Buddha, holding the Buddha Land within the palm of his hand, becomes an indomitable force from which no one can escape. Amidst this divine realm of Gods and Demons, Qin Jun solemnly pledges to rise as the preeminent Divine Emperor, determined to carve his path to unparalleled strength.

The main character Lei Yu does not have the ability to practice his family’s martial arts. He gets stepped on and tossed around. Due to certain reasons, he leaves the family, coincidentally gains an ability, and makes his own path to becoming an immortal.