Well, it could be about Naruto somehow losing control of his chakra in a new and extreme way that causes him to literally explode. Maybe an enemy uses a new type of jutsu that backfires on Naruto's own chakra system.
One possibility in this kind of fanfiction is that Naruto is experimented on by some rogue ninja or a new, evil organization. They try to manipulate his chakra in a way that it becomes unstable. Eventually, this instability reaches a breaking point and he explodes. This could then lead to a whole new story arc where his friends try to bring him back or seek revenge for what happened to him.
Chapter 9, ", How Many Devices are Free to Use?", is the clearest early answer because it turns Abandoned Cave Society's situation into a concrete plot event. The chapter turns that into something concrete by moving from As people age and undergo more hardships, and with the safety of the... to Then, the 'Prisoners of Oblivion' beat them up.. What makes it stick is that the chapter closes with This wasn't mocking his uncle;
Chapter 126, ", Long Live the Governor!", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Actually, not all the people in the inner city are wealthy. and follows through with Work hard, and next year, the governor can change to a sports car..
Chapter 171, ", I thought you really came to support my cousin", is the clearest early answer because it turns Blackbird Heavy Industries's situation into a concrete plot event. The chapter gives readers a real answer by opening on Seeing the name 'Blackbird Heavy Industries,' one can deduce that... and ending on No need for battle, isn't that great for everyone?.
Chapter 184, ", Treatment of C9 Level Employees", is the clearest early answer because Mechanical Priest finally turns buildup into a real advancement. The chapter turns that into something concrete by moving from By the time the entire situation was reported up the chain and became... to However, that did not stop Gu Hang from taking this matter very....
Chapter 20, "chapters, all about geniuses", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Four 'Walkers' were the first weapon Gu Hang could deploy to shatter... and follows through with Worried there might be an issue, he approached the governor, but only.... By the close, Moreover, they had learned about the storage location for the..., and the chapter closes with "Don't overthink it;
Chapter 33, ", The Fast Track to Development", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The setup is In Gu Hang's plan, he intended for the Abandoned Cave Society to..., but the pressure keeps building through It was well located, being closer to future raw material and energy....
Chapter 152, ", Tribe (7K words, please subscribe!)", is the clearest early answer because it turns Storm Squad's situation into a concrete plot event. Early on, If there had been a reliable ally force drawing attention at the.... By the end, It was, of course, another Green Skin Orc, standing right beside the....
Chapter 126, ", Long Live the Governor!", is the clearest early answer because it turns Composite Brigade's situation into a concrete plot event. The chapter turns that into something concrete by moving from These regimental banners were distributed, and soon they were raised... to The mood among the residents of the outer city was not so complex..
Chapter 13, ", Help Each Other Out", is the clearest early answer because it turns Rage Owl Star's situation into a concrete plot event. Early on, It can be done." This unexpected answer allowed Yelisia to vaguely.... By the end, Of course, this action wouldn't be as heroic as showing one's prowess....
Chapter 133, ", Loyalty is the Top Priority", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with This allocation of grace points would give his two division and... and follows through with In terms of policy, it would also be possible to define the....