MTL - Super Battleship Reborn - Chapter 27 Special Materials Research Base

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.

Deep below the earth's surface, a mystifying subterranean seascape lurks, an archipelago bathed in inky blackness where suspense and horror hold court. Here lie strange islands and even stranger monsters, far beyond the realms of human imagination. In this domain, mankind is far from dominant; instead, madness and death rule supreme.

Pleading for mercy from the unknown creatures of the deep only leads to a slow, tortured existence. The trapped survivors gradually distort, losing what made them human, both physically and mentally, to the gloom as they remain trapped in this eternal obscurity. Their only hope? A perilous expedition into uncharted sea territories.

Fueled by determination, Charles embark on this daunting voyage aboard his steamship, aiming to reclaim humanity's past glory. Together with his crew, they sought a way out of this hidden sea world, a path back to the sunlit world above, where humans once stood tall.

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I read a few comments from Chinese readers that compared this novel with Lord of Mysteries because of similar elements: Lovecraftian, western fantasy, first industrial revolution, and steampunk. However, I have yet to finish reading Lord of Mysteries to do any actual comparison, but I do think those who have enjoyed that novel would enjoy this as well. Also, the author of LotM, Cuttlefish That Loves Diving, also did a shout-out for this novel, so I guess he approves of it too?

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Everyone transmigrated to the High Continent and became a Lord to participate in the conquest between Lords from all the other races.
A few lucky Lords would receive Lord Talents.
“Hah! My talent is the Knight’s Hall, a Diamond-Tier Lord Talent! My subjects can job change into a unique warrior class, the Combat Spirit Knight!”
“My Lord Talent is the King of Abyss. I can summon demons to become my subjects!”
“I have a lot of subjects who are scientists! I can create advanced technologies!”
“My Talent allows me to cultivate! I’ll become a celestial!”
Zhou Zhou received a Legendary-Tier Lord Talent — 100% drop rate!
Not only could he see the things he would receive from an enemy, but his enemies would drop all of their loot when they were defeated.
“Watch as I make you drop your Talents!”

This is a very interesting thing. It is obviously dim and black, but it can emit a golden light, which makes people deeply fascinated by it…

- Description from novelbuddy