I'm not sure specifically as it depends on the particular fanfiction. But generally, it might involve Sakura facing challenges while in some sort of situation with snakes. Maybe she's trying to escape from their coils or deal with some power related to the snakes.
Most likely Sakura is one of the main characters, as the title mentions her. And the snakes could be considered characters in a sense, or there could be other characters related to Sakura who might be trying to help her out of this situation with the snakes.
In a fanfiction, the kabuto snakes' coils might have a special power related to the sakura. For example, their coils could be the key to unlocking the secret magic of the sakura, which is fading away. A hero or heroine might set out on a journey to figure out how to use the snakes' coils to save the sakura and the land it blesses.
One possible plot in such a fanfiction could be that a character discovers a hidden grove of sakura trees, and within it, the Kabumaru snakes. The snakes' coils seem to be connected to the life force of the sakura. As the character tries to understand this connection, they get drawn into a world of magic and mystery that revolves around these two elements.
One great fanfiction in this theme could be 'Sakura's Encounter with Orochimaru's Snakes'. In it, Sakura has to face off against Orochimaru's snake coils in a very dangerous situation. It really shows her growth as a character from being a timid girl to a strong ninja. Another could be 'Snake Coils and Sakura's Power', which focuses on how Sakura uses her medical ninjutsu skills to counter the threats posed by Orochimaru's snakes.
The plot could involve a prophecy that ties the kabuto snakes' coils to the sakura. A chosen one is destined to bring together the power of the snakes' coiled forms and the essence of the sakura. Maybe the snakes' coils hold a map or a code that is inscribed on the petals of the sakura, and the protagonist has to decipher it to save their world from an impending doom.
One common trope is the 'Rescue Mission'. Sakura gets trapped by Orochimaru's snake coils, and her friends, like Naruto or Sasuke, come to her rescue. It plays on the idea of friendship and loyalty in the Naruto universe. Another trope is 'Sakura's Hidden Power'. When faced with the snake coils, Sakura discovers a new, hidden aspect of her power that she didn't know before, which helps her escape or fight back.
You can start by searching on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Use the exact keywords 'Kabumaru snakes coils sakura' in the search bar. If there are no exact matches, try variations like 'Snakes named Kabumaru and sakura' or 'Kabumaru snakes in a sakura setting'.
In some fanfictions, Sasori's cables and coils could be related to Sakura in a combat scenario. For example, Sakura might have to find a way to counter Sasori's attacks that involve his unique cables and coils. It could be that she uses her medical ninjutsu knowledge to analyze the chakra flow within the cables and coils to find a weakness.
Without having read 'manda coils sakura fanfiction', it's only speculation. But if there is a unique 'coil' element, it might bring in themes of mystery or enigma. The sakura could add a touch of the idyllic or the dreamy. And if'manda' is a character or entity, themes around identity and self - discovery could be part of the fanfiction. It really depends on how the author interprets these elements in their creative work.