Naruto. the Uchiha and the heavenly stardust Volume 1 Sasuke's story

Summary: "Years after the great shinobi war, Naruto is struck with a mysterious illness. Desperate for a cure, Sasuke and Sakura embark on a dangerous undercover mission in the distant land of Redaku. Together they discover a nefarious plot of life-and-death proportions and a battle that will test this husband-and-wife team till death do they part. Sasuke Uchiha heads for the isolationist land of Redaku, where he'll need to infiltrate an astronomical observatory that's being operated as a prison for deadly criminals. There he has a rendezvous with none other than his wife, Sakura, and together they dive into an investigation to uncover traces of the Sage of Six Paths! With danger lurking around every corner, what fate lies in store for the ninja couple?"--