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

Art: 7/10
The art overall was good but the backgrounds were sometimes lacking in tones or things to fill the space. The anatomy and proportions of the characters checked out. There were a few noticeably nice-looking environmental and panoramic shots; there were a good amount of spreads showcasing artistic skill or things about their world which I appreciated. The impact shots looked good and there was a good use of nature shots that added a bit more depth to their world. Although a bit short, The heavy action sequences looked pretty good. Overall, while I thought there could have been a bit more background in a few of the slower panels, the art was good. When there were backgrounds, they looked good. When there were impact shots, they left an impact and when emotions needed to be expressed I felt a bit of it.

Panel Progression: 6/10
The flow of the panel progression felt jumpy sometimes but overall it felt alright. There wasn't too much flair in the form of panel cutting or interesting layouts. Much of the panels and dialogue were pretty confined but that wasn't a bad thing. There were some nice mix-ups in panel layout in a few chapters such as the sequence where Togata was driving the truck and getting shot over and over. Like I mentioned earlier, there was some nice use of tones but I feel there could have been more supporting backgrounds and tones for more than a few places; but then again a large majority of the settings take place in snow/snowstorms.

Characters/Plot/Development: 6/10
I mostly disliked the characters? Agni was a bit one-dimensional for a bit of the first half and that was fine, but I sort of disliked how wishy-washy his resolve ended up being at certain parts of the story. Togata had an interesting backstory and personality. Togata was probably my favorite character. Sun/San was lame. He stayed static all the way through his introduction, capture, and rescue. Then Sun/San boringly followed suit with the atmosphere of the manga and went down the darker road: developing into a crazy worshiper of Agni. I really wanted something to develop with Sun and Agni's relationship, but that was dropped in such a lazy way. Sun/San was pretty much forgotten about for maybe half the manga despite the interesting setup he initially received at the time of his first-meeting with Agni. Furthermore, I was disappointed in how easily the Agni-Doma-revenge plot was dropped maybe 10 chapters in, picked up multiple chapters later, and then brushed over briefly in the span of maybe a chapter or two. It's annoying because that plot point is what I picked this manga up for in the first place. While I understand there was some resolution to their revenge scenario later on during the orphan-cottage bit and while I did see a point in Doma's words during his speech, I felt like the whole resolution to their relationship was stupid. Agni finally showed some growth as a character, forgoing his path to revenge to become a better person; a person, a hero, a god that would exist on a spectrum opposite that was the norm of the harsh and cold world that the story takes place in. NOPE, Agni goes back to kill Doma and all the kids. The pacing and development were a mess in my opinion. Agni mostly never grew, Doma maybe had 20 pages to himself during the whole manga, and the overall situation regarding the world-ice-age was handled in an awkward and convoluted way. Togata was the only redeeming character who had good development in this manga. I appreciate the sorts of topics that Togata's character touched upon in the story. Overall, I was unimpressed with the needless dark fantasy this manga went over: The bestiality, the cannibalism, and retro-gradation of modern ideologies such as the role of women, religion and morality.

Conclusion: 5/10
The conclusion to the story was stupid and honestly seemed half-assed to me. It was abrupt, it felt weak, and it most certainly was way too out of left-field for me to accept.

Overall: 6/10
The initial 10 or so chapters where the initial plot setup were interesting to me, but the plot got progressively more complex or forgotten from that point on. The best parts about this manga were when Togata was taking the lead or pretty much whenever Togata was involved. The answers to a lot of the plot points in this manga felt really weak and uninspiring. Warming up the earrth with a big tree that can reach to other planets? Dumb. The good things about this manga in my opinion were the art, the setting, and Togata. I didn't like pretty much everything else.