Fantasy: I Can Instantly Comprehend Everything - Chapter 4

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.

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

Ye Qingge, a 22nd century dual-material firearms master, wears it!

Encountered a vicious aunt?

Ye Qingge unhurriedly took out a gun, and after shooting…

My aunt is crying!

Encountered a group of vicious bandits?

Ye Qingge unhurriedly took out a machine gun, and after firing…

Bandits cry!

Encounter an enemy army with wolf ambitions?

Ye Qingge unhurriedly resisted a shoulder-fired rocket, after launching…

Army cry!

Couldn’t help but look up and ask the sky, is there no one who can restrain her?

The emperor of a certain country who looks at the common people like nothing: let me try

A certain uncle who looks like a banished fairy on the outside and has a black belly on the inside: I will try it too

Ye Qingge: Do you choose a pistol, a machine gun, or a rocket?

A certain emperor: …

A certain uncle: …

&

I heard that Xiao Guo’s “ghost-faced” general who uses soldiers like a god and has first-class marksmanship is actually a woman?

Prince Zhou Guo on the battlefield: “Woman? No more fights, no more fights, I want to get married!”

A romantic emperor from the southern kingdom: “I happen to be short of a fierce queen, so that I can suppress the harem.”

A certain prince with white veils in the Xiao Kingdom: Sorry for being late.

- Description from novelbuddy