it seems that Aria has some sort of memory problems.
I don't think it's memory problems, I just think she's really fucking olde
More like Aria is not comfortable divulging information about Ichika's grandmother yet. It's a really touchy subject with her and from the looks of it, the grandmother was about to commit suicide in the flashback. That's not something you just go flapping your gums over to the granddaughter.
Even though I love the story and these two, I find it a bit off putting that there's a possibility that Aria is just obsessed with Ichika because of how similar she is to her grandma
(Ch. 19) yeah I think Aria is starting to feel some guilt about their relationship. Between the “I’m leaving to protect you” vibe and the thinking about her grandma, I think it’s being made pretty clear that Aria’s not been/being completely open about what’s going on for her vis a vis their relationship.
I went back to re-read this after the latest chapter and know that we know what grandma looks like, this page https://dynasty-scans.com/chapters/vampeerz_ch14 make so much sense.
This means that her grandma was ALSO one of those few people capable of wielding the sword. We had a little bit of foreshadowing of this on this page too: https://dynasty-scans.com/chapters/vampeerz_ch03#19
when Ichika refused to kill Aria and she said that reminded her of Chiyo, before being cut off my Ichika.
Someone earlier said that from the looks of it, grandma may have tried to kill herself so maybe because she had tried it and knew what it felt like, she refused to take Aria's life?
Sorry if it's kind of a lackluster analysis but no one had pointed it out and I just had to.