Comprehensive Manga: The Strongest Demon King Starting from Demon High School

The underworld is the legendary place where demons, fallen angels and many elves and ghosts live.

Inside a splendid castle

"drink......ha......"

A young man is trying hard to swing his sword in the yard

"Nine thousand nine hundred and ninety-seven......Nine thousand nine hundred and ninety-eight......Nine thousand nine hundred ninety-nine......Ten thousand!"

"call......call......"

The young man lowered his sword, wiped the sweat from his forehead and panted.

The sixteen-year-old boy has short silver-white hair and a pair of bright black eyes.

Although that handsome face is still a little immature, there is a trace of perseverance and composure that is not expected at this age.

"Roy can't be lazy! Today I have to swing my sword a hundred thousand times!"

A cold and serious voice sounded behind him.

"Got it, sister!"

Roy nodded helplessly.

"Really, being so serious every time I practice is not cute at all."

Roy muttered a few words and continued to swing his sword.

Roy is a time traveler. How he traveled through time is unknown. His current name is 'Roy Lukifugus'.

When he first came to this world, he also There was some doubt.

But a few years after coming to this world, Roy was completely convinced.

The world that gave him a new life was the world of Devil High School.

Devils, fallen angels, monsters, elves, and angels......Even dragons and gods.

These existences that should exist in fantasy are real in this world.

The person who just spoke was his sister, named Grayfia Lucifergus.

She is the descendant of the demon king Lucifer in the original work. She is known as the strongest queen among all the descendants in the underworld, nicknamed the silver-haired Queen of Annihilation.

But now she is no longer the queen of the devil Lucifer.

Gurefia was born outside the prologue to the Lucifergus clan, a famous member of the demon family. The family has been serving the old demon king Lucifer for generations.

During the demon reform, he fought against the reform faction as a member of the old demon king faction, and finally competed with the demon king Serafru for the seat of the strongest female demon.

Although the battle failed, his strength is already at the level of the Demon King.

This also made the Lucifergus clan become a powerful demon family in the underworld and broke away from the Lucifer clan.

However, due to the war with the reformists, there are only two people left in the entire Lucifergus clan.

And Roy is the last male of the Lucifergus clan.

Roy originally thought that he was born into a famous demon family and had such a powerful sister.

Then I will definitely be able to have strong strength, defeat all the demon kings, and take all the girls I like as my family.

Lysa Phoenix can be said to be a role model for all demons in this regard.

However, the ideal is beautiful, but the reality is cruel.

As the last heir of the Lucifergus clan, Roy did not have a strong talent for cultivation.

Even though he has been practicing hard for more than ten years, he is only as strong as a lower-level demon now.

Looking at Rias and Kurana who are the same age, they have already reached the strength of upper-level demons early on.

Such a talent made even him want to give up practicing, but his sister Gulefiya did not give up on him.

He will still watch him sternly every day as he completes his training.

And it is precisely because of this that Roy's reputation as a good-for-nothing has spread in the underworld.

But he doesn't care.

"Ninety-nine thousand nine hundred and ninety-seven......Ninety-nine thousand nine hundred and ninety-eight......Ninety-nine thousand nine hundred and ninety-nine......One hundred thousand!"

"call......call......"

"Finally finished sword swing training!"

Roy bent over and supported his knees with trembling hands. The sweat on his face was pouring down. He had no time to wipe it off.

However, this was just the beginning of a day of training.

"Roy, let's take a rest first! Start learning magic later!"

Gurefia looked at Roy who was working so hard and finally showed a smile.

"call......Got it sister!"

Hearing that he could take a rest, Roy finally sat down on the ground tiredly.

After resting for a while, it was time to learn magic.

However, with his useless talent, he has only learned a few words in so many years. It’s just a basic magic.

Such as teleportation array, memory erasure, magic bullet, healing magic and the most important contract magic, etc.

If you want to sign a contract with a dependent or familiar, you must use contract magic.

Of course, signing a dependent requires You need demon chess pieces.

Demon High School is a very wonderful world. Although humans make up the majority of this world, only demon kings and gods are the masters of this world.

Of course, there is also the mysterious god known as the Infinite Dragon God. Fez, and the True Red Dragon God Emperor, also known as the Great Red Dragon.

These are all existences that stand on the ceiling of this world. In such a wonderful world, Roy is naturally not willing to be ordinary, let him watch what he likes He would never be able to make a girl fall into the arms of others.

Since he is not willing to be ordinary, then let's make a splash! If you don't have the talent to practice magic, just practice swordsmanship.

While other children are playing, he is practicing.

While others were resting, he was still practicing.

And precisely because of his crazy energy, his swordsmanship had reached perfection. In terms of swordsmanship alone, he was confident that no one in this world could be his opponent.

In his previous life, he was just An ordinary person, but since he has come to this dangerous and wonderful world, of course he must realize his dream.

And if you want to realize your dream, you need strong strength...................................................

(PS:New book for newcomers! Asking for flowers, comments, book reviews, and three consecutive chapters!

Your support is the author’s motivation!

The new book will not be less than 20,000 words on the first day of release. Please support me, I love you! mwah!

By the way, the author has uncensored 1-4 for high schools! )