So you have a standard adventuring party who defeat the Demon King and bring an era of peace to the land. One member of the party, an elf named Frieren, is only loosely attached to her companions. It's clear that she considers the ten years of their adventures to be no time at all and that their association barely registers on her, despite the great deeds they have participated in. And that's the first chapter.
Time dilates in this story, mirroring Frieren's experience as a long-lived elf. We get her reaction (or lack) as her former companions age and, eventually, die. And we see how unaffected she is. Or appears to be. The tale picks up when one of her very clever companions, the reprobate priest, tricks her into taking his ward as an apprentice. What follows is Frieren's natural curiosity being bent on itself to engage her in the people she once knew.
The story really picks up as Fern joins in Frieren's journey and the time dilation slows a bit. Fern's impatience with tasks that take months, even years, reminds the reader how distinctly odd Frieren's perspective is, even as we're drawn into the effect of these diversions. And realize, as Fern does, the hidden depth to the trivial tasks she is undertaking—such as the search for a now-rare flower to festoon a neglected memorial site. Awareness of the hidden depth builds slowly and is delivered with a light touch that drew me in.
This first volume ends with a twist as Frieren learns that souls may be real and of a location where she might find her deceased companions. I'm interested to see how this plays out, though I'll admit to being a bit skeptical as well. So far, it's unusual and engaging for that unique quality. I'm not sure how that'll hold up now that Fern is a core character and the quest is more overtly established.
So I'll call this four stars, mainly for the unique perspective and a subtle, but competently delivered, portrayal of those past relationships. And the jury's still out on the moments that break the overall tone. I can't tell, yet, if they're a respite or a distraction.