Naruto falls ill, and Sasuke goes to the Tatar Observatory to try to find a cure.

Sasuke is attacked by Meno, the guardian of the Observatory, and then poisoned. Just when he thinks it’s all over, he is rescued by Sakura, who has infiltrated the Observatory as a doctor. She gets Sasuke reassigned to assist her, and they begin their undercover investigation. From the intel that Sakura brings, they learn that Ultra Particles were what cured the Sage of the Six Paths, but in order to find out where it is located, they need to obtain a document called the Map of the Heavens. They decide to search the Observatory’s library for it.

Seeking information related to the Ultra Particles, Sasuke searches the cellar of the room belonging to Zansul, the director of the Observatory, while a messenger of the prime minister is visiting from the capital. To buy some time, Sakura transforms into the messenger. While Zansul is distracted, Sasuke tries to sneak into the basement, but they start to get anxious when things don’t go according to plan. Meanwhile, Zansul tells Sakura something disturbing.

Sasuke and Sakura work together to gather information concerning the Ultra Particles. Unfortunately, there is still much they don’t know, and they are unable to figure out where to get answers. Eventually, Sasuke finds a clue to the whereabouts of the Ultra Particles from something his cellmate mentions. Meanwhile, Sakura discovers a hint to unraveling the mystery of the Map of the Heavens from a game called Star Lines. Having finally gathered the information they need, Sasuke and Sakura try to obtain the Ultra Particles. However…