MTL - Rich Devil - ~ Twenty-one testimonials

A useless prince, yet brimming with kindness and compassion—his smile as warm as sunlight, illuminating this darkened era.But that was merely a mask, hiding the poisonous and mad nature beneath.A monster lurking behind a gentle shell.A system that feeds on stolen Heroines.He will outplay destiny—and rise as the world’s ultimate villain.

He wants indoor plumbing. They think he’s conquering the world.Arthur was a genius engineer on Earth, capable of optimizing global logistics and automating entire factories. But he lacked one thing: common sense. Now, reincarnated as Arthur von Pendelton, the six-year-old son of a powerful Duke in a medieval fantasy world, he faces his greatest challenge yet: Drafts.Armed with the T.E.C.H. Interface (Trans-Epochal Construction Heuristic), Arthur can analyze magic like code and build modern technology from scratch. His goals are simple: Double-glazed windows, hot showers, and a toaster that doesn't burn the bread.But there is a problem. The people of this world don't understand engineering.He builds a high-pressure boiler for a bath; his father thinks it’s a “Dragon-Breath Siege Weapon.”He creates a hydroponic garden; the local church declares him the God of Harvest.He ignores a Princess's flirting to analyze the thread count of her dress; she thinks he is playing “hard to get.”Follow Arthur as he accidentally industrializes a kingdom, terrifies his enemies with home appliances, and remains completely oblivious to the fact that he is becoming the most powerful man in history.All he wanted was a warm bath.

As long as you are brave enough, Insect Girl will take maternity leave (King of the Undead)

Can the ghost of the Demon Slayer be able to conceive a child? Let the miserable girl verify it.

Infinite comprehensive flow, harem flow, I wrote the book for the cute girl in the second dimension.

The heroine is a must! A female partner is also necessary! No… it’s nothing! Just basic operations.

The first world “School Island” “Saga Idol is Legend”

The Second World “Demon Slayer”

The third “King of the Undead” and “The Rising of the Shield Hero”

Fourth “Goblin Slayer”

If you have a favorite girl, please say in the book review, if you miss a girl, please point out.

Please don’t tell me not to dismantle cp and the like.

- Description from novelbuddy

Infernal Demon Dragon: A dog like you dare to face me in combat? Do you wish to die so much?