One idea could be a crossover where Naruto characters are summoned into the Throne of Heroes universe and have to compete in the Grail War. Another could be a story where Naruto himself becomes a heroic spirit in the Throne of Heroes and uses his ninja skills in a new and strange world.
Well, you could have a plot where the villains from Naruto, like Orochimaru, manage to infiltrate the Throne of Heroes system. They start to corrupt the heroic spirits there. And Naruto, along with his friends, have to travel to this new realm to stop Orochimaru and his evil plans. This would bring a whole new level of conflict and adventure as they deal with both the unknown rules of the Throne of Heroes and their old nemesis in a new setting.
Perhaps a plot where the power system of Naruto is combined with the concepts in Throne of Heroes. For example, Naruto characters could gain new abilities based on the Servant classes in Throne of Heroes. Sakura could become a Caster - type Servant with enhanced medical ninjutsu and new magical abilities. And the story could revolve around how these characters adapt to their new powers and roles within the Throne of Heroes world.
If you want the clearest chapter reference, go to Chapter 93. Early on, Jiang Li looked back and saw several aunties linking arms, walking up the...; later, the chapter leans on The leader was indeed the aunt to whom she had read fortunes this morning..
The best chapter pointer here is Chapter 117, "What Jiang Li Can Do, She Can Do Too!". It opens with Fragrant and cloyingly sweet potatoes and corn were out of the pot, and Qi... and closes on Since entering puberty, his mother had exerted strict control over his....
Chapter 109 is the strongest chapter-level answer because it starts from And another thing," Jiang Li said, taking out a tissue to wipe her lips,... and follows through on [You're indeed more likable than me, the type of likable where people....
Chapter 83 is the strongest chapter-level answer because it starts from When they received the task, the three of them were already sharpening... and follows through on Since all the guests were staying at Uncle Zhao's cabin, Director Sun....
The best chapter pointer here is Chapter 108, "Without accumulating virtue through words, calamities of bloodshed will only increase, not decrease.". It opens with In a glamorous Michelin three-star restaurant, Su Yinwan and Shang...
The best chapter pointer here is Chapter 131, "This Lady is Here to Travel". It opens with Just around mealtime, Director Sun came over pushing his small food cart. and closes on Hungry, they no longer cared about their appearance, quickly washed their....
A practical answer is Chapter 92, because it turns the idea into a concrete scene. The chapter opens with Jiang Li, lightened from any task, had plucked a few leaves from the..., adds pressure through Just as Jiang Li was about to refocus and continue expanding her..., and ends on Finally, someone.
The best chapter pointer here is Chapter 150, "Has She Been Cursed?!". It opens with Upon hearing the first part of Jiang Li's words, Zhang Cheng dismissed... and closes on He spent the last few days visiting various renowned doctors, while also....
A practical answer is Chapter 83, because it turns the idea into a concrete scene. The chapter opens with When they received the task, the three of them were already sharpening..., adds pressure through All of this was thanks to Jiang Li's patient guidance., and ends on Since all the guests were.
Look to Chapter 85 for the clearest answer. It begins with Facing everyone's skepticism and curiosity, Jiang Li explained fluently:..., keeps building through The tomatoes are grown by them, and the eggs are also from their..., and lands on This fresh and vibrant flavor blended perfectly..