My life as a reborn monster - Chapter 18 - Road Less Traveled.

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.

Within the world of Arcadia, there exists an eccentric restaurant. The restaurant causes countless apex Mages to set aside their arrogance and pride, just to feast upon its delicacies. What did you say? You want to abduct the Chef? Could it be that you also want to force him to be your personal Chef? Are you an idiot? You would first have to get through a legion of men and women whose stomachs and bodies were thoroughly satisfied. Not to mention, the restaurant is guarded by a Divine Fox who killed a Mana God Realm Mage with a casual whip of her tail. What, a Divine Fox isn’t strong enough to scare you? Then, how about a group of Yanderes?

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

Zhou Wenwen, who had traveled to a parallel world because of sudden death, thought that he could only live in such an ordinary life in this life, but the golden finger finally opened. He has a store where he can buy technological items and magic equipment to ensure his survival.

But the threat that followed made him realize that this place is not ordinary, because there are Transformers, Marvel, the Dark Portal from World of Warcraft, etc.

- Description from novelbuddy