The Path Toward Heaven - Chapter 819 - Number One

Meet Sora and Shiro, a brother and sister who are loser shut-ins by normal standards. But these siblings don’t play by the rules of the “crappy game” that is average society. In the world of gaming, this genius pair reigns supreme, their invincible avatar so famous that it’s the stuff of urban legend. So when a young boy calling himself God summons the siblings to a fantastic alternate world where war is forbidden and all conflicts–even those involving national borders–are decided by the outcome of games, Sora and Shiro have pretty much hit the jackpot. But they soon learn that in this world, humanity, cornered and outnumbered by other species, survives within the confines of one city. Will Sora and Shiro, two failures at life, turn out to be the saviors of mankind? Let the games begin…

He was reborn in the world of Naruto as a member of the Uchiha clan, known as Uchiha Genya. Born with the rare dual-pupil Sharingan, many saw him as a monster. Luckily, his father, Uchiha Kinya, was wealthy and influential, and he managed to protect Genya along with his mother Senju Yumi.Genya hoped for a peaceful life, but everything changed when he turned seven. The night of the Uchiha clan's massacre began.“You want to wipe out the clan and kill my father? Then don't blame me for fighting back”Uchiha Itachi: “Can your cursed eyes really break through my genjutsu?”“Dual-pupil Sharingan with six tomoe? How terrifying will you be when you awaken your full Sharingan? How many powers will you possess?””What terrifying strength... One punch can shatter the Susanoo!“That fateful night, Itachi slaughtered the Uchiha clan and defected from Konoha, but Genya managed to protect those loyal to him.Uchiha Obito: ”Genya can actually disrupt my Kamui?“Madara: ”A dance, you say? Ahem... Genya doesn't need to join!“Ten-Tails: ”This guy has more chakra than me!“

It begins on the mountain.

With the glint of a knife, a flash of steel in the hands of a sworn brother. A betrayal.

Stabbed and pushed down the mountain, Zi Chen lied within the red-stained snow, left to die.

This is where it begins; he is given life by lightning,
baptized by thunder.

Those who had once betrayed him should all suffer in his cruel revenge.

- Description from Novelupdates

He was a wealthy and mysterious financial backer who had appeared before her when she needed money the most. After the courtship, she took the money and left.