For the research into Earth Grudge Fear, Tobirama quickly issued orders to gather the finest Medical Ninjas in the Medical Department and begin analyzing and improving the technique. This was bound to be a long and arduous task. The first problem the Medical Ninjas faced was not how to improve Earth Grudge Fear, but how to reconstruct it from Kakuzu's Corpse.
Although Kakuzu was dead, making it impossible to extract the secret technique from his mind using the Yamanaka Clan's secret techniques, practicing ninjutsu altered a ninja's chakra meridians according to the nature transformations they had trained in. Medical Ninjas could study these changes to uncover the secret techniques the ninja had learned in life. This was part of what made a ninja's Corpse valuable, and a secret technique like Earth Grudge Fear, which depended entirely on bodily mutations, left particularly obvious traces.
Even so, reconstructing Earth Grudge Fear from Kakuzu's Corpse remained a troublesome undertaking. It was a high-level secret technique, after all. If it could be deciphered so easily, it would hardly deserve that distinction.
Thanks to their earlier agreement, Tsunade was also allowed to participate in the research into Earth Grudge Fear. Of course, with her current abilities, she could offer little help and could only watch from the sidelines. As a result, she could leave the Medical Department early each day rather than sleep there like the other Medical Ninjas.
Through Tsunade, Kazemori Masaki could keep up with the progress of the research. According to her, the Medical Ninjas involved were practically forgetting to eat and sleep. They usually only rested when their bodies could no longer hold out, and they did not even have a chance to go home. It was grueling work.
Kazemori Masaki could only cheer them on in his heart. After all,