Toaru Majutsu no Index: New Testament - Volume 17, Epilogue: Or Doubt Contains the Truth - Bet_Time.Red_or_Black.

The hero who was killed by the demon king ended up reincarnated as the son of the one who killed him! Thus began the life of the hero who donned in the mask of the ideal demon prince to topple his own kingdom while doing his best to prevent anyone from discovering his identity―― But to do that and blend into the demon tribe society, he had to kill his former comrades. Nevertheless, to become stronger, to save humanity, he had to walk through all kinds of paths of carnage! This is the tale of the demon race’s fake prince destroying his own kingdom.

O Hero, Trample Those Who You Should Protect!

TN: Most part of the other character in the novel is depicted from a non-human perspective so expect something that is completely different from the common sense of human.

Unhindered in the Demon Domain, the king is solitary!

In the world where immortals and demons strive, a good natured fellow sought the Demon Dao in search of justice.

At the end of his journey, he had eventually become this generation’s Heavenly Demon Emperor.

Although I am not fond of slaughter, I do not dislike it!

Desiring to see the Demon World, this is how I strive, this is how I become the Peerless Demonic Lord!

- Description from Novelupdates

Kai was a 17-year-old dropout. A NEET. A background character in real life with nothing to his name but bitterness, novels, and guilt. After his parents died, he gave up on the world. People were fake. Dreams were pointless. And that one novel he kept reading? He hated it especially the main character, June. Perfect, noble, always standing tall. Everything Kai wasn’t.Then, one night, a voice asked: “What if you did meet June?”He said yes, half-asleep and half-mocking.Now he’s trapped in the novel. Isikeid. But he’s not June. He’s not a hero. He’s not even in the main cast.He’s an extra in the background of a world he knows too well and he’s had enough of watching things play out the same way. This time, he’s going to change everything. Whether the world likes it or not.

From the poor little girl who ate hundreds of meals in the small mountain village to the wealthy lady, the five-year-old Nuan Nuan lived a life of being favored by the whole family.

The elder brother is cold and reticent, he is the heir of the Gu family

The second brother is a genius with a gentle personality and high IQ, and the youngest professor in the research institute.

Third brother is a top star with fans all over the world.

The fourth brother is a cold and talented doctor who can save his life in the hands of the king of hell

Wu Ge is a talented painter, and a painting is worth millions.

Brother Six is ​​a wild school bully

Seventh brother has a black belly and a bear child, he is the king of children.

And Nuan Nuan was favored by his brothers after returning home.

Note: Not all elder brothers are biological elder brothers, there are cousins ​​and cousins.