The most powerful genjutsu, Kotoamatsukami, was renowned far and wide. If Wu Yu said he wasn't curious about it, he'd be lying.
Using it once required a long time for its ocular power to recover. Shisui Uchiha's pair of Mangekyō Sharingan were extraordinarily rare even in a ninja world full of overpowered cheats. It practically made one wonder whether his eye technique had been too absurdly broken, forcing this method to be used to limit it.
The right Sharingan of Shisui Uchiha that Shimura Danzō had obtained could even unleash the Mangekyō ocular technique—Kotoamatsukami—without removing the bandages or making eye contact with the target, subtly altering their will.
Based on the fundamental principle of having absolutely no trust in that old dog Danzō, when Wu Yu entered the adjacent meeting room through Nature Integration, he had Mysterious Kaguya carefully check whether Danzō's right eye was emitting ocular power to influence Tsunade.
They were only discussing the agreement with Sunagakure, and Tsunade was hardly such a pushover that she would be overly courteous to Sunagakure. But what if Danzō went mad and decided that unless Tsunade took the opportunity to devour Sunagakure completely—or even directly plot to annex it—she was betraying Konoha?
Following Wu Yu's instructions, Mysterious Kaguya carefully observed the Chakra in the meeting room and found nothing unusual.
Tsunade's aura, on the other hand, was a little unsettled, but that was purely due to impatience, not because she had fallen under some ocular technique.
Wu Yu made a circuit of the meeting room before finally sitting on the coffee table. He stared at the face of this darkness of the ninja world. No expression could be seen on the exposed left half of Danzō's face, and even his left eye was only half-open.
Shimura Danzō did not speak much.