In this 'Naruto released from jail' fanfiction, it could be that Naruto was jailed because of some false accusations related to a powerful and dangerous jutsu he was suspected of misusing. After his release, he embarks on a journey to find the real source of the jutsu and prove that it can be used for good. Along the way, he meets new allies and old enemies, and has to use his wits and strength to overcome various obstacles.
One possibility could be that Naruto emerges from jail with newfound powers. He might have been framed and while in jail, he discovers a hidden power within himself. He then uses this power to clear his name and also to protect the village from a new threat that emerged while he was incarcerated.
It could be the same people who framed Naruto and got him jailed in the first place. Maybe a group of rogue ninjas or corrupt village leaders who see Naruto as a threat to their power.
It could be a powerful ninja from another village who saw Naruto as a threat even when he was in jail. This ninja might have been plotting to take over Konoha while Naruto was out of the picture. Now that Naruto is out and godlike, they see him as an even bigger obstacle to their plans.
Maybe Naruto breaks out of a prison in a hidden village where he was wrongly imprisoned. He then has to evade capture while trying to prove his innocence.
Well, perhaps Naruto accidentally breaks a really important and ancient law in the ninja world. It could be something related to a forbidden jutsu that he was unknowingly involved in. As a result, he's thrown into jail. There, he might start to reflect on his actions and ninja way, and also try to find a way to prove his innocence while making some unexpected allies among the prisoners.
One possible plot could be that Naruto was wrongly imprisoned. After being released, he has to prove his innocence while also dealing with the changed perception of him in the village. He might go on a journey to find out who framed him and along the way regain the trust of his friends and the villagers.
Perhaps Naruto ends up in jail due to some political conspiracy in the ninja world. While in jail, he discovers a secret underground network that is planning something big that could endanger the whole ninja world. He then has to use his skills and wits to stop it from inside the jail, all while dealing with the harsh conditions and difficult inmates.
Perhaps Percy is in jail as a sacrifice for someone he loves. In the fanfiction, he might be accepting his situation at first, but then his friends outside start to plan a rescue mission. It could show his loyalty and their determination to get him out.
One possible plot could be that Edward is wrongly accused and is in jail. His friends outside start an investigation to prove his innocence. They might face many obstacles like uncooperative witnesses or a corrupt system.
Kurama might start to lose his power in Naruto's jail. Since he's confined, his connection to the natural chakra sources could be severed, causing him to weaken gradually. Naruto would then have to find a way to restore that connection, perhaps by finding a hidden key within his own memories that unlocks the jail and restores Kurama's power.