That epilog, that last page, that last panel. I read it as a symbolism that MC get back together again with his wife, where they can hold hand as long as they like, wherever they go, together to the eternal rest in peace.
Kinda made me feel relieved, at least my grandma is old as fuck so her dementia is kinda to be expected, having this happen to someone still young would be the worst thing. It's hard enough for it being an older relative forgetting who you are & stuff, but a partner or sibling, even a child? Fuck that very much.
wow, I remember reading this year ago, I didn't remember what the plot was, but I think the feels I had then and now are the same, haah, I am gonna take the later parts as their afterlife happiness headcanon