SPOILERS!!!!!!
There is this moment in the training sequence in Rune's route where he closes your eyes with his hands and asks you who is the dog that's talking to you
I fully expected for Rune to freak out if Luke says something like "Acri" out of the blue, but nothing happens, I guess Rune doesn't remember Acri either...
Shelter is capable of preserving life experiences as a consequence of absorbing mana, because...that's what mana is. It has no effects on memories, other than on Skies Ablaze.
I think it was explained that because each shell has some of Luke's mana, that is why people can see memories from others' perspectives. (which is why he keeps getting flashes when he's on the roof, where mana particles aren't absorbed)
