So let's say that on top of being a hero school, UA also has multiple Youth Behavioral Rehabilitation Programs for different issues. And one of those programs is "Perverts Anonymous". Mineta is obviously forced to enroll after the whole sports festival fiasco. But who else should be "volun-told" to go?
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So this post was inspired by another. Here's the link to the original post: https://www.reddit.com/r/NarutoFanfiction/s/UJpuIVbF2C
So an idea of a fic would go as such:
Narumi, through jutsu and/or sealing bullshitery, was sent to Naruto's universe at an earlier point of time and becomes his "Nii-chan".
In the original post that inspired this story, Kakashi was caught off guard when Naruto mentioned he had a sister at home. I had stated that it was because he was kept in the dark about her as a prank and revenge for not checking up on his sensei's son until team 7. Obviously Sarutobi and Jiraiya know about her with the latter helping make a two way dimensional seal for her to travel back and forth with.
She's much stronger than Naruto would be at the end of the fourth Shinobi war (which she had herself ended) but is only concerned with raising her brother and keeping him safe. As such the Sandame "hires" her to be Naruto's caretaker and bodyguard but in reality it's actually a stipend to care for Naruto with a generous bonus for her to make-up for Sarutobi's failings (which she absolves him of but he still insists). And in the beginning she works as an assistant cook in Ichiraku Ramen.
She's usually chill and easygoing most of the time but she can also be strict like someone who lives the military lifestyle which results in Naruto having a cleaner home and being more mindful of others (his elders and superiors at least, she's more then happy to look the other way if some asshole gets glued and feathered in retaliation to being a jerk to her brother).
Things start changing for the worst however starting with the wave country mission. The mission starts off as it usually does and even follows the same path as usual up until team 7 and the bridge builder reaches Wave. Immediately signs of things not being well are seen as gato and his thugs can be seen from the shore line *impaled* on long stakes along the beach, blood dripping from their bodies turning the sands and water dark red. Investigating further they find that the only survivors of wave's massacre are Tsunami and her son Inari who are sitting on the couch next to the perpetrator of the massacre.
The perpetrator is someone Narumi knows all-to-well from her timeline...
After returning from wave, team 7 gets temporarily shelved until they can find someone who can train them never mind enter them into the exams, until Kakashi is cleared from medical leave (Kakashi has a message for Narumi specifically *carved* into his back by Waves Killer). Narumi reluctantly takes Kakashi's spot as team 7's temporary sensei.
The next major event to change significantly is the chunin exams:
First unlike in cannon rather than just the sand village and a few other minor Shinobi villages getting invites to the exams hosted by Konoha, Iwa kumo and kiri also get invited. However the kicker is that no one in Konoha's leadership approved those invites but to avoid scandal and revealing they may have been infiltrated the invites are treated as genuine.
And second when the Konoha crush is enacted, the perpetrator isn't just Orochimaru but also the Slayer of Wave himself. However things become chaotic as during the crush, the Slayer of Wave then betrays Orochimaru and mortally wounds him before indiscriminately attacking and killing everyone from any of the villages. He racks up a terribly high kill count using a vector movement jutsu and a touch based instant death jutsu that kills anyone he tags.
The leaf genin are sent to safety while the villages chunnin, jonin, and even ANBU and ROOT forces fight off the combined threats of the invaders (currently panicking at the sight of a speedster slaughtering everyone indiscriminately) and the psycho killer. Natsumi breaks off to personally intercept the Killer at the site where Sandame's fight with Orochimaru would have taken place.
There it's revealed that the identity of the killer was in fact Narumi's insane older brother Arashi who managed to follow her to this timeline. Arashi is a special sort of insane as he's obsessed with his "family" and close acquaintances, but will also torment and torture them as a sign of his love because *"adversity makes you stronger"*.
The same line of reasoning that nearly ended their world to begin with.
In the end, not only has Konoha and the other villages been dealt a terrible blow, but natsumi must train Naruto and his friends as Arashi has begun his plans to bring about the end times once again...