Yichen began sensing the area within three kilometers as Ōnoki had instructed, but three kilometers was the limit of his sensory range, and his perception was already rather blurry at that distance. A circle with a three-kilometer radius had a circumference of nearly twenty kilometers and an area of almost thirty square kilometers. Finding a potentially hidden enemy in such a vast region was far too difficult.
On top of that, the other side might be hiding underground like they were, or up in some large tree. That multiplied the difficulty several times over. After sensing for more than three hours, Yichen had found nothing.
After stopping his Sensory Ninjutsu to rest for a while, Yichen decided to try a different approach. He did not know how the Aburame Clan's insects conveyed information to their masters, but there were no more than two possibilities. One was for the insects themselves to fly back to their masters, while the other was to transmit information remotely through some special method. High-level creatures could certainly communicate remotely, but for low-level creatures like insects, transmitting complex intelligence over a distance was far too difficult. If it could be done, Chakra would definitely be involved.
So Yichen did not need to blindly search for the other side. He only needed to follow the insects to find their master.
With that thought, Yichen began carefully observing the Kikaichū he had noticed earlier through his sensory abilities.
To improve his chances of success, Yichen monitored four Kikaichū at once. After about half an hour, he discovered that although the insects did not fly back to their master, every so often, they would emit faint Chakra fluctuations in one particular direction.
A smile curled at Yichen's lips. There really was something. The direction of the Chakra should be