After he was declared hokage. Konohamaru sarutobi assembled three shinobies from three different nation. Reason being after the war all the bodies were recoverd by the medical core but three member of hokage squad were still missing.
The reason konohamru was so fixated on this trio because they were the last full blooded saki's and they possess a special keke genai. The demon eye and the eye of cancelation. The demon eye can release gen jutsu and identify ones chakra nature, and the eye of cancelation can cancel natural energy from one's body. So there bodies were important so the keke genkai does not fall into wrong hands.
Makka of the sand, Toby of the sound and Rider of the mist. All three of them were elite ninja from differ nation and specialist in hunting and tracking rouge ninjas. And were hired by the 6th hokage kakashi hatake. "was the brief about the mission given to you by 6th ?" asked konohamaru.
"Yes sir!" replied makka of the sand
'Knocking on the door' "come in" replied konohamaru to the knocking on the door
Kakashi enters the office along with Sasuke and then said "all three of you will be going in 4 man squad under the leader ship of Sasuke Uchiha who is an elite tracker ninja of the leaf" "I'll take it from here plus this a not a place to talk such sensitive topic" said Sasuke and took the three shinobies with him.
Soon they reached to an abandoned building in the middle of forest near the outskirts of the village and in the building there were few high level ninja of cypher core including ibiki mohino....