Double Penetration, I Walk Between Naruto And Demon Slayer

Traveling through Naruto, Uchiha Arashi, who had no golden finger, could only survive and grow, hoping to change the fate of the genocide. However, he was unable to prevent the night of genocide from coming.
In order to survive, Uchiha Arashi had to fight with Obito and Itachi in a battle of wits and courage, but in the end he was unable to escape due to his low strength.
Just before he died, he was forced to awaken the Uchiha clan's biggest plug-in, the Mangekyō Sharingan. Finally, under the influence of the Sharingan's ability, Arashi traveled to the world of Demon Slayer and survived.
But how could Arashi, who was unwilling to be ordinary and vowed to take revenge, let Uchiha Itachi and Obito go.
When Lan learns the breathing method, what kind of sparks will be created when the collision of breathing method and ninjutsu occurs?
(New author, please make sure you are full and enjoy!!!)