You will probably heard about Dagashi Kashi being a few hours worth of advertisement for Japanese snacks. I'm here to tell you that... I agree as well.
Dagashi Kashi can be a bit heartwarming and stress-free due to the environment settings and no climax or cliffhanging plot. The setting of this anime puts the character in a small town out of city, no overly advanced technology, little to no cars on the road, train or bus could cause you to wait for hours if you missed it. The vibe of such peaceful environment paired with slice of life element can be a bit relaxing at times.
Let's talk about the story. Mainly, Dagashi Kashi is talking about Japanese snacks so if you are someone who would love to know them, I would suggest that this anime could be for you. Storywise, the anime is fixated on a boy who dreamed to become a manga artist but is asked to inherit his family business, as dagashi shop owner, which is not what he wants. The story starts off smooth with this introduction with decent potential. However, as the episode goes on, it felt like a random episode introducing different types of dagashi that fits the theme, which don't really contribute to the main story apart from the main character knows a lot about dagashi. Thus, it starts to grow a little bit bland overtime.
Onto characters. The characters in Dagashi Kashi is quite limited. This is good in a sense that the anime will focus on these characters. However, paired with the issue with the story, the growth of the characters are very slow (because the anime's main point is the dagashi!). I have to admit that the characters are quite likeable as some of them often gives you a good laugh, IMO none of them feels boring, they each have their own likeable characteristics.
In short, Dagashi Kashi is a relaxing, comedy, slice-of-life anime. If you are someone who is after for an interesting plot, this might not be your cup of tea but if you have some spare time, you can give it a shot. If you are someone who loves to learn more about Japanese snacks in form of anime, I recommend you to try and pick this up!
TL;DR:
Want to know about Japanese snack, pick this up;
Want a decent story and plot, drop this;
Want to spend some time for a relaxing anime, you can try to see if it suits you.