To show his sincerity, Uzui Tengen took off the jeweled necklace he wore on his head, saying it could be used as tuition.
Uchiha Hikari pondered for a moment. "Would you be willing to learn something unflashy?"
"...That works too."
Uzui Tengen nodded.
Though he always talked about pursuing "flashiness," he knew that many useful abilities were not flashy at all. Take his own Sound Breathing, for instance—it was rather unremarkable among the nine Hashira, unable to compare with Flame, Thunder, or even Love. If he could truly learn a few techniques from Uchiha Hikari, there was no need to be picky.
"Fine, then."
Considering that they were both in the same line of work, and that she herself wanted to conduct an experiment, Uchiha Hikari tried teaching Uzui Tengen how to refine Chakra.
But the results were far from satisfactory.
No matter how hard Uzui Tengen tried, he could not refine even a trace of Chakra.
However...
When Uchiha Hikari tried a different approach—using her Yachihoko ability to split off a bit of Chakra and inject it into Uzui Tengen's body, then guiding him to use hand seals to direct its flow—Uzui Tengen actually managed to cast a Clone Technique!
Though the result was utterly dreadful, it was a genuine ninjutsu!
That was rather interesting.
"As long as one possesses Chakra... even people from the Demon Slayer World can use ninjutsu?"
With a try-it-and-see attitude, Uchiha Hikari injected a little more Chakra into him and taught Uzui Tengen some basic knowledge of ninjutsu.
By the second week.
Uzui Tengen could barely use the Transformation Technique and Substitution Technique from the Three Body Techniques. In particular, when he transformed into the appearance of his three wives, the effect was convincing enough to pass for the real thing. The downside was