December is the month of Sasuke as episode 485 and 486 will focus more on Sasuke's life and story. The episode will also reveal more about the mysterious detonating men that has appeared in Konoha and to some other villages. Sasuke gets an information who might behind the attack and hinted that he might be doing an investigation.

In the previous episode, Konoha was attacked by unknown culprits. Sakura, Naruto, and Kakashi are doing an investigation due to the disappearances of some people in the village and found some odd observation as they saw someone they knew who went missing are one of the zombie-like detonating men. In the upcoming 485 episode, Sasuke will do an investigation by himself, seeking information from Oroshimaru. Oroshimaru then leads Sasuke to Oyashiru, an arms dealer who may know about the odd zombies who explode.

According to MNR Daily, in order for Oyashiro to appear, Orochimaru tries to set up a trap. Sasuke and Orochimaru then proceed to an island where rich people pitch their shinobis against each other just for fun.  A deal between Sasuke and Oyashimaru has been set where Sasuke need to win, he has left no choice but to join the quest as he wanted to find out the truth.

Episode 486 spoiler:

As promised by Oyashimaru that he will unveil the information Sasuke wanted to hear. Sasuke will gather his old team again, Karin, Jugo, and Suigetsu. Sasuke's team won against the shinobi pit by Oyashimaru, Sasuke learned that Lighting Group might have something to do with all the chaos that has been happening.

According to iTechPost, Oyashimaru revealed the name of the leader of Lightning Group and was known as Fushin. Sasuke made an effort to challenge every shinobi for freeing them all. With the help of some other shinobi, Sasuke defeats the Kiri ninjas who were also the mastermind of all the detonating shinobis. 

Sasuke will learn the birthplace of Fushin, in Kirigakure the route of the missing ship. He will be attacked by some unknown being and the attacker will use genjutsu. He can't do anything but to use the Sharingan to stop the assault. The episode 486 will uncover the reasons why there are human bomb attacks.  

Episode 486 is set to air the week after episode 485 (December 8) released.