Itachi pairing + heavily altered timeline + slow pace.
Bai Ziming, a young man from the 21st century and an extreme shut-in obsessed with ninjas, transmigrates to the shinobi world just before the Uchiha Clan Massacre.
In this broken world, ninjutsu has fallen into darkness, and evil forces are spreading.
Bai Ziming chooses to work with the Space-Time Administration and travel to the shinobi world of the past. He decides to eliminate the Uchiha clan before the massacre begins and prevent the shinobi world from falling.
Taking on an alias, Bai Ziming joins the Uchiha clan and begins operating in secret.
He uses his superb ninjutsu to intimidate the Uchiha, while secretly befriending the brothers Itachi and Shisui and trying to convince them not to carry out the order to massacre their clan.
But Bai Ziming's identity and true purpose gradually begin to come to light before Itachi, and their friendship and their duty to the shinobi world will face a major test...
