Jing Ming transmigrated into Demon Slayer and, for no apparent reason, got bound to a System that insisted he was Uchiha Sasuke.
[Host confirmed: Last surviving member of the Uchiha Clan! Uchiha Sasuke!]
[Core mission engraved: Never forget the pain of the Uchiha Clan's extermination. Kill the traitor and enemy, Uchiha Itachi, and restore the glory of the Uchiha Clan!]
[Current threat assessment: The hostile genin before you is weak and poses no threat!]
[Beginner mission issued: Kill the hostile genin before you and display the authority of the Uchiha Clan!]
[Mission reward: Three-Tomoe Sharingan!]
Staring at the demon before him, whose blood-red eyes were fixed on him, Jing Ming asked in disbelief, “You call that a genin?”
It would be nice if the protagonist combined Naruto's ninja system with the Breathing Sword Type, such as the Chidori, and the protagonist turned it into a big move of Thunder Breath, so that it would feel more acceptable, instead of using ninjutsu in a unique way, which is easy to be suspected, and easier to be targeted by evil spirits.
Very good fanfic
Author: Are you a Zenitsu chef? The protagonist's role is a bit less, the group portrait
Not bad, there is a plot and the details are well drawn.
It's nice, but too little. Keep it first.