This will most likely be answered in arc 7, but what do you people think their connection really is?
it's interesting one, I have no guesses more than he was one of fingers bunch of years ago and had to take down the strongest oni . but he expected her to be dead? maybe he forgot their colors
It can also be that he met her before the cult attack to her village.
It can be another fuckery like Subaru's ability and he met her in a complete different place than that 'world'
Aldebaran is truely hard to understand with such short screen time
What do you think?