Volume 3 is the final volume. While the volume itself was well paced, I feel that the author hasn't explored her story to its fullest potential.
The characters are compelling, and realistic in the way they hurt others. Unfortunately, I feel that they don't show as much remorse towards their victims as they should. This would've made sense in a longer series where they're still undergoing their character arcs and facing the consequences of their actions, and not in the final volume of their series.

Tsugu is the closest thing the story has to a protagonist, but her character is stagnant in comparison to the rest of the cast, at least until the last few chapters. I think it's a deliberate choice by the author, since she wanted to shed more of a spotlight on the other characters, but I think it's a bit of a waste that she didn't have a "I want to change!" moment that the others had.

Despite this, I found The Golden Sheep a very fulfilling story to read. While I don't think it reached its full potential, I'm only upset because I was attached to the main cast and their journeys. I felt very emotional during the final chapter, and was sad to see it end.

The one-shot (standalone story) at the end of the volume was interested in the technical sense as (I believe) it implies that the manga could've been longer, but that the author chose to end it that way.
As for the one-shot's story, I really enjoyed it! It's about a human soul who decides to reincarnate as the son of a very young woman.

The story is told from the perspective of the son in heaven after dying, showing the consequences of his death afterwards.

It made me tear up multiple times during the course of the story. It touches on life, death, poverty, motherhood, and love.