Yumi to kurumi is a bittersweet slice of life tale that illustrates one's personal growth and happiness in a shott span of 8 chapters.
Enter the life of Yumi Tanaka; a socially inept office lady who thinks lowly of herself. After stumbling upon a sentient doll that deems to bring happiness to its owners, Yumi's life began to change for the better.
For a relatively short read we got to see Yumi's healthy development of becoming a better person, that doesn't feel forced or shallow in a way that got me intrigued as to how it will goes down. The story itself is cute and simple, and easy enough to follow, as it is short, however the shortness of the story is also its shortcoming: It is very shortlived that I wished there were more chapters to further explore more of the story.
As for the art, the artworks and paneling are smoothly drawn and articulate to follow, it synergizes well with the cute and innocent artstyle.
Overall, I'd rate this manga a 6/10, I honestly can't rate it any higher. It has good potential and I wish there was more to it. Yet I would still recommend it when you got 20-30 minutes or to spare.