One possibility is that Naruto is on a quest for self - discovery. Leaving the village to find the Sage gives him a chance to be away from the familiar and face new challenges alone. He might encounter different types of enemies and allies during this journey. This could also be a way for him to prove himself not just to the village but also to himself. He wants to show that he can grow and become stronger without always relying on the village's resources.
In this fanfiction, Naruto might be neglected not just by the villagers but also by some of his so - called friends. This heartbreak makes him leave. He then travels to different lands. Along the way, he meets an old hermit who teaches him ancient ninja techniques that are long forgotten in his village. With these new skills, he contemplates whether to return to the village and show them what they missed out on or to start a new life away from the place that has caused him so much pain.
One possible reason could be that Naruto discovers some dark secrets about Konoha that shatter his idealized view of the village. Maybe he finds out that the village elders were involved in unethical practices, like using shinobi for immoral experiments. This would make him lose faith in Konoha and decide to leave.
It could be Danzo. Since he's always been a bit of a shadowy figure in the Naruto world, he might be the one behind Naruto's neglect in the village. He could have spread rumors or influenced others to keep Naruto down, and when Naruto leaves, he might send agents to stop him from becoming a threat outside the village.
Well, it could be that Sasuke decides to join Naruto in leaving. They've always had a complex relationship. Maybe Sasuke sees Naruto's reasons for leaving as valid and decides to support him, which strengthens their bond.
He could meet other powerful ninjas from different villages. Maybe some reclusive ninjas who are experts in certain jutsu that can help Naruto enhance his skills. For instance, he might come across a ninja who is a master of water jutsu in a far - flung land near a large body of water.
I'm not entirely sure specifically as 'narusasu' might refer to characters from a particular fandom (possibly Naruto). However, 'hard lemon' in fanfic context often implies a more intense or mature-themed fanfiction which may include elements like strong emotions or complex relationships. But it's important to note that such fanfics may not be suitable for all audiences.
It could be that in this 'naruto of the demon village fanfic', Naruto discovers a hidden power within the demon village. This power could be related to an ancient demon that once lived there. He then has to figure out how to control or use this power for the greater good, while also dealing with the internal politics and power struggles within the demon village.
It could also be that Naruto is forced to leave Sakura due to some external threat or danger. For instance, if there is an enemy targeting Naruto and he fears that being around Sakura will put her in harm's way, he would choose to leave to keep her safe. This is in line with Naruto's selfless nature as seen throughout the series.
In 'narusasu lemon oneshot fanfic', a frequent theme is the discovery of new sides of each other. Naruto and Sasuke have known each other for a long time in the Naruto world, but in these fanfics, they might discover new emotional and physical aspects of one another. There could also be themes related to protecting each other in a more intimate and possessive way, which is often enhanced by the romantic and 'lemon' elements of the story.