[Crossover] When Sasuke Became a Heroic Spirit

Even if the world lies in ruins, I will still stand here. Uchiha Sasuke. Freed from the chains of revenge, he is a man who fights for the bright future his closest friend hopes for. No one knows the wish he has kept hidden in his heart all this time. While carrying out a mission, he is gravely wounded and brought to the brink of death. In that instant, a wicked miracle takes hold of his wish. "I will give you a chance. In exchange for granting that wish, I want to claim what comes after your death." It is a voice from the world itself. Taking on the form of Assassin, a killer who strikes from the darkness, Uchiha Sasuke begins his quest for the Holy Grail. He is summoned to a place that is not quite the same as the world he knows. But one thing remains unchanged: Uzumaki Naruto is still here. The Holy Grail War. Endless slaughter and desperate cries of despair. Amid it all, is there still a glimmer of salvation? [Notes] - This idea came to me because Uncle Sasuke is so handsome. The previous version was hard to write, so I changed the point of view. Basically, Uncle Sasuke becomes a heroic spirit and takes part in the Holy Grail War in the Naruto world. - The servant summoned by the Sasuke in this world is Red Archer. The main villain isn't Madara. The Holy Grail War in this world is a little like FGO, but I've stretched the timeline out quite a bit. - Since there are two Sasukes in this story, Uncle Sasuke is called Assassin for now. - Guess the pairing? Theme: Even if the world lies in ruins, I will still stand here.