>>280351209
More or less, they all form part of the same story arc, search "White Night Honkai", it was the character presentation of that arc.
>>280351284
Yoru is an evil horsefu so she has a great advantage over Asa. I think Asa could be way more popular that she is right now, the problem is that Fujimoto stopped writing her as a main character after the Falling arc, the current Asa is not a very compelling character.