To some extent, it is. However, like many accounts based on real experiences, there could be elements of embellishment or interpretation to make it more engaging.
In the manga, Zero Two and Hiro have a different fate. They don't die. The plot takes them on a journey with various challenges but not to the point of death.
Zero Two is a very strong - willed and somewhat brash character, while Naruto is also determined but more open - minded. In a fanfic, when they first meet, there could be a bit of a power struggle as they both are used to being leaders in their own ways. However, as they face challenges together, like fighting off a group of powerful enemies that are a combination of rogue ninjas and klaxosaurs, they start to rely on each other. Naruto's optimism and belief in his friends starts to rub off on Zero Two, and she becomes more willing to trust others. And Zero Two's fierce loyalty and combat skills earn Naruto's respect, leading to a deep friendship between them.
The 'bravo two zero' real story is about a military mission. It was a Special Air Service (SAS) operation in the Gulf War. A small team faced many challenges and difficulties during the mission in enemy territory.
I don't think it's a straightforward true story. Usually, such shows take liberties and combine various elements to make it more captivating. Maybe there are loose connections to reality, but it's not a pure retelling of actual events.
In the 'bravo two zero real story', the main characters were the soldiers of the Bravo Two Zero team. These were highly trained SAS operatives. Andy McNab was a prominent member among them. He later wrote about their experiences, which brought the story to a wide audience. They were all men who volunteered for a very dangerous mission behind enemy lines in the Gulf War.
I recommend two novels to you: "Lord Zeng wants to defeat the Buddha" and "Getting the Buddha's Relic at the beginning." The protagonists of these two Xianxia novels had eaten relics and obtained special abilities and powerful strength. I hope you like this fairy's recommendation. Muah ~😗