*Disclaimer*
Just personal scratch.
Advised, possible spoilers.
Opinion & Informal

Art: 4/10
The anatomy and proportions in this manga were something else lol. I won't give examples but the anatomy and proportions were really off in this and I don't think it was intentional. However, what I do think was intentional was the contrast in facial distortions between people based on changes in their state of mind and their natures. For example, people who were being evil had slowly evolving changes in their facial features that made them look progressively distorted. However, good characters and characters who eventually tried to redeem themselves had nice-looking faces. There were no showcases of the artist's skill such as panoramics or other things. There were no nice looking nature showcases. The impact shots didn't look like they were a cut above the regular art. The impact shots also looked a bit meh. There was a lack of supporting tones as well as detail in a lot of the objects and environment. For what I think overall...the art was pretty bad...

Panel Progression: 5/10
The panel progression was average. The layout was plain and uninteresting. Panel-cutting was kept at an absolute minimum. The pacing was at a good speed, but there were a lot of places where I would have liked a few more panels for context. There were multiple times that it felt like a few more panels could have made the interactions or action sequences clearer. Overall, the panel progression didn't have any flair and was just about average.

Characters: 5/10
The character designs were mostly normal-looking but I didn't feel like anything was done to make any of the characters memorable. Most of the characters actually had very similar faces and facial structures so it would have been hard to tell characters apart other than by their hairstyles or context. The character development was a bit underwhelming too. The reasoning behind the bullying was sort of lame and all the craziness didn't have a good foundation to make anything believable. The blond girl who wanted to be a beautician was alright. It was nice how she came to her senses and eventually wanted to reconcile, but all of that hopeful development was quickly buried just like how she was became buried in the snow after she died a few pages after her redemption. The camera boy was stupid. Sure, it was a good twist that he was actually a terrible person but after the blond girl died, it felt like the story was going to head into a very predictable ending. The growth of the MC was also not too eventful. After losing her family all of her interactions past that was just killing the people who wronged her. I sort of wished that there would have been some sort of personal aside or contemplation about her state of being during this time. I didn't want the rest of the story to just be an exercise in revenge and nothing else; unfortunately, it was just that and that ended up making most of the latter half pretty boring and predictable.

Plot: 5/10
The setup was nice. The flower, hepatica, and what it represents was a good way to introduce the plot and the coming events. The whole, "blooms after the winter snow" was a good foreshadowing to what the manga would be about. I liked the initial setup of the plot.

Development: 5/10
While I did like the plot setup, everything else development wise was a bit boring; girl gets bullied, eventually gets pushed over the edge, kills everyone. That's about it. None of the characters showed any redeeming or likable qualities. A majority of the characters were made to be mindless scumbags just to fit the narrative of the plot. A few of the more notable bullies got some background stories and were fleshed out a bit, but they still ended up being lame. None of their past tragedies or circumstances made any difference in how I felt about them while they were alive or when they were dying/dead. The only thing I liked about this manga was when the blonde girl tried to redeem herself and reconciled with the MC. It was a kick in the shin when the blonde girl ended up dying a few pages after this event.

Conclusion: 6/10
All the questions or plot points that should have been resolved properly didn't need to be answered because everyone was dead. The final fate of the MC was fine. She gave up being a flower and as a result it was appropriate for her to wither away in the snow storm. A hepatica, which she no longer was and was something that she willingly chose to lose, blooms when the snow clears. It was appropriate for her to die in the snowstorm because she gave up everything for her revenge.

Overall: 5/10
This was entertaining enough. The initial plot setup was neat and I liked the foreshadowing it created. I also liked how at least one of the characters, the blonde girl, tried to redeem herself and the character development of this manga. I disliked how linear/straightforward the development became after the MC went over the edge. It was so linear that it made the later half of the manga very predictable: MC goes around getting revenge then either gives up on revenge and moves on or dies in the end because of her path of revenge. This manga was entertaining for what it was, but the art and development choices were turn-offs for me.