Shinji froze, the shock on his face growing more pronounced.
He was familiar with this kind of sensation.
Back when he had used Susanoo Lamp to control his grandmother's pair of Mangekyō Sharingan, his own Mangekyō had responded to hers in a similar way.
The appearance of this sensation meant they were a perfect match!
That was why he had been able to use Susanoo Lamp to merge the two pairs of Mangekyō Sharingan into one, creating a pair of Eternal Mangekyo Sharingan.
Otherwise, even with his current Dojutsu, it would have been difficult for him to forcibly merge two pairs of Mangekyō Sharingan with Susanoo Lamp.
Back then, the two pairs had been a perfect match because they were blood-related Mangekyō Sharingan, and could indeed be merged into a pair of Eternal Mangekyo Sharingan.
But the match he was sensing now left Shinji baffled.
"Why is this happening?"
He furrowed his brow and fell into thought.
One pair was Red Eyes, the other Ketsuryūgan. Even if there was a blood connection between them, it went back at least a dozen generations, perhaps even dozens—at the very least, more than a century.
After so many generations, the Red Eye and Ketsuryūgan clans could only be considered distant relatives. Their bloodlines had long since ceased to be connected.
Besides, neither the Super Blood Dragon Eyes nor the enhanced Red Eyes were natural.
Both pairs had been forcibly fused by Shinji using Susanoo Lamp, and their bloodlines had long since become muddled.
So this compatibility definitely wasn't due to their bloodlines.
A thought crossed Shinji's mind, and he narrowed his eyes.
If it wasn't a bloodline match, there was only one possibility left: their Chakra natures were compatible.
In other words, the Chakra natures of the Ketsuryūgan and the Red Eyes happened