Toaru Majutsu no Index: New Testament - Volume 8, Epilogue: Lance. Lance_of_"Gungnir".

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.

“From today onwards, you will become the Envoy of one of the Main Gods in the Dimensions of Gods. You will travel from one world to another and through that, you will attain what others will never obtain in their entire life.”

The moment these words echoed in Fang Li’s head, Fang Li’s life was destined to be extraordinary…

- Description from novelupdates

The future was doomed, the present was gloom, the past was regretful. At this point, the only reason I was still alive was because my heart and brain functioned and then one night after a great fap, I woke up to a totally different reality, one where I was in the past.[System installation complete][Welcome host to the Perverted Sugar Daddy System]A system that would help me fulfil my perverted desires as a sugar daddy. I hadn't planned for this, but I sure as hell was ready to milk it to the fullest.[You’ve been taken back in time]“Ahh, a strong and vibrant body to work with”. A better name for the system should be the 'Perverted Emperor Tyrant Daddy System'.The name might be a stretch, but what I'm trying to say is that this world is so screwed. Everyone better hide their wives, sisters, mothers and even grandmas from.... wait“System can we make them younger and less wrinkled”[yes]“Yes, hide even your grandmas cause I'm going to be doing a lot of screwing and bankrupting.”Did I mention that I love to own what I like.It's not that I'm a bad guy, but I like Facebook and Lamborghini, so how much.....“Na let's leave a bit of Tesla free, Musk knows his stuff”TAGS: Mind control, Gangs, manipulation, corruption, oyakodon.PS: All characters in this book are above 18

Choi Hyun-seok, a heavyweight champion of the biggest mixed martial arts league on Earth and the one who was called the strongest had died.Afterwards, he was granted new life as a hero in another world.‘Wealth! Honor! Endless beauties at your fingertips!’With thoughts of such a dazzling future, the first thing that he saw when he came to this new world was a towering ox monster.The monster, who was the commander of the demon army, asked.“Hero? You’re saying you’re the hero?”“Uh…I think…?”And so, that was the start of hell.