A plot idea could be that Naruto's high fever makes him lose his memory temporarily. This creates chaos as he doesn't remember his friends or his ninja training. His friends have to re - introduce themselves and help him regain his skills while also protecting him from those who might take advantage of his vulnerable state. Or perhaps his high fever is a side effect of an experimental jutsu he tried, and he starts to exhibit new and uncontrollable powers that he has to learn to master while dealing with the fever.
One idea could be that Naruto gets a high fever right before a crucial mission. His friends, like Sakura and Kakashi, have to figure out how to complete the mission without him or find a way to get him better in time. Another plot could involve Naruto's high fever causing him to have strange dreams that give him insights into some hidden jutsu or mystery in the ninja world. Maybe his fever is the result of a new enemy's attack, like a poison that also affects his chakra flow, and the story could revolve around finding the antidote and defeating this new threat.
In a fanfiction, Naruto's high fever could be related to a curse placed on him. As he battles the fever, he also has to deal with the effects of the curse, such as seeing hallucinations of his past failures. His friends, especially Hinata, stay by his side, and their relationship deepens during this difficult time. Meanwhile, they search for a way to break the curse and cure the fever, which might involve going on a dangerous quest to find a rare herb or consult an old sage.
Well, a plot could revolve around a strange curse that affects the students in Naruto Slasher High. Naruto might be at the center of it, trying to break the curse while dealing with his regular high - school life, like exams and making friends. Also, there could be a plot where a new teacher comes in with a dark secret related to slasher powers and Naruto has to expose it.
One idea could be a sports competition at the high school where Naruto and his friends compete in a ninja - themed track and field event. Another could be a school dance where there are some unexpected alliances and rivalries revealed. Maybe a new student arrives who has a mysterious past related to the shinobi world.
One plot idea could be that Naruto is summoned to the High School DxD world by a powerful magic user who mistakes him for a powerful demon. Once there, Naruto has to prove that he is not a threat while also trying to find a way back home. Along the way, he befriends some of the students at the school and helps them with their own problems, like protecting the school from a sudden attack by a group of rogue devils.
A plot idea could be that some of the devils in High School DxD want to learn the secrets of chakra from Naruto. So they kidnap him to their world. Naruto then has to find a way to escape while also dealing with the political intrigue among the devils, angels, and fallen angels. Another idea is that Naruto's shadow clones could be mistaken for some new type of summoned creatures in the DxD world.
A possible plot for 'naruto high school harem fanfiction' could be that Naruto is given a special project in high school where he has to work with a group of girls. As they work together, the girls start to develop feelings for Naruto. There could be drama within the group as some girls are more forward in their feelings while others are shy. And Naruto, being his oblivious self at first, slowly starts to realize the situation and has to figure out how to handle all these new emotions and relationships.
Another plot could be that there is a threat to both the Naruto world and Monster High. Naruto teams up with the Monster High crew, and during their adventures, some of the female characters start to develop feelings for him. He is constantly saving them with his Rasengan and other jutsu, and his kind heart makes them fall for him one by one, creating a harem.
Well, a great plot might be that Ino is tutoring Naruto in a difficult subject like chemistry. As they study together, they start to develop feelings for each other. Also, there could be a high school play where Naruto and Ino both audition for the lead roles. There's a lot of drama and competition, but in the process, they fall for each other. And perhaps there's a mystery in the school, like something going missing from the art room, and Naruto and Ino team up to solve it, bringing them closer.
Well, it could be that Fem Naruto is a transfer student to Konoha High School. She tries to fit in but finds it difficult as she has a different style of ninja - skills compared to the local students. As she tries to adapt, she also uncovers a plot by a group of students who are trying to undermine the school's headmaster. With her determination and unique skills, she sets out to stop them and in the process, earns the respect of her classmates.
One idea could be that Naruto and Sakura are paired up for a school project. Along the way, they start to discover new sides of each other. Maybe Naruto shows his hidden intelligence and Sakura her more vulnerable side. This could lead to a budding romance as they spend more time together outside of their normal friend group at school.
One idea could be that Naruto and Gaara are paired for a school project. Naruto's outgoing nature clashes with Gaara's more reserved one at first, but as they work together, they discover they have more in common than they thought, like their love for their families. They end up becoming good friends and helping each other through high school challenges.