Toaru Majutsu no Index: New Testament - Volume 13, Prologue: Another Possible Demise — Before_the_End.

The teenager Long Ao, ten years of silence, was reduced from genius to waste, and was ridiculed and mocked.

Ten years of persistence, ten thousand failures, and finally won mysterious Dragon Seal.

With Primal Chaos Saint Body, cultivation invincible cultivation technique, refining Heaven and Earth, devouring endless stars, sweeping the wasteland! Ask the vast stars, who dares to fight me? Boundless Starry Sky, War God! …

- Description from Uukanshu

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

I originally thought this was a world like an ordinary urban novel…Drawing comics by myself, traveling is pretty good.
But tell me, what happened to this magician called “Emiya Kiritsugu” who jumped on my face?
Who changed the settings?
Currently involved in the content of “F/Z”, “F/SN”, “Fantasy Carnival”, “The Emiya’s Meal”, “The Holy Grail of the Imperial Capital”, “FLA”, “Elmello II Event Book”, “FGO”, “FE”, etc.
Others related to “JOJO’s Bizarre Adventure”, “Rebellious Lelouch”, “Persona 5”, “Attack on Giant”, “Death”
“FGO”, “FE Series”, “FA”, “FSF”, “Cangyin”, “Magical Girl Illya” will be involved next…

- Description from novelbuddy

[Ding! Dragon Monarch System has been activated.]
Aditya finds himself in the body of a 19 years old dragon. Aditya learns the misfortune fate of the former Aditya. Being a man from the 21st century, Aditya decides to change his fate.
Being married to the 7 goddesses of this world, Aditya walks on a path to prove himself to his wives and to his family.

"Goddess of War"
"Goddess of Alchemy"
"Goddess of Wealth"
"Goddess of Wisdom"
"Goddess of Lust"
"Goddess of Music"
"Goddess of Nature"
--------

Disclaimer: - The image used is not mine. If the author messages me, I will take down the image.