Before you ask, yes, I too watched it after seeing that one scene from the trailer. (ʘᴗʘ✿)

This show is pure madness. No logic, no explanations, if it looks crazy & awesome, it will do it. I tried to find any patterns between the different elements in this world, but I failed miserably.

So, it's set in post-apocalyptic Japan, where a "rust" wind is causing a disease that slowly corrodes everything, including people. The story is a quest for a mushroom called "Rust Eater" (Sabikui) that has the power to cure this rust disease. Our main dude's job is to find that mushroom and make the medicine to cure the disease while the government is chasing him to death.

There are no limits to what might appear in this show, huge crab that can run faster than most military vehicles - yes, arrows that can shoot exploding mushrooms- yes,

Spoiler, click to view

huge helicopters with mouths- yes, kids with guns- yes, moving crab mountains- yes, hippos as military vehicles- yes,

cute anime girls- yes.

Even with a world so crazy like that, it managed to keep me interested in it until the end. The story kinda went down-hill in the last few episodes. But the first few episodes are the best this show has to offer.
It doesn't have a super complicated, highly detailed plot, it's just two guys fighting together to protect their people. The fight scenes are one of the strongest points of this show along with the soundtrack that fits perfectly with the weird stuff happening on screen.

The story was very interesting even after the first few episodes, the world building was nicely progressing until the last 3 episodes. It had fun moments, awesome action scenes that are pure adrenaline madness.

But, let's talk about the end. I had really high expectations for this show after seeing the first few episodes, but I have to say, it didn't quite meet them. It just felt like it created an immediate threat

Spoiler, click to view

tetsujin thingy

out of nowhere to end the show with a huge fight. But it felt very unnatural when it decided to escalate quickly

Spoiler, click to view

I mean the appearance of Tetsujin after Bisco's "death", like the powerful dude is died just now, who the hell is going to kill that damn thing

. And the last 2 episodes continued to make the end as satisfying as possible, but couldn't quite do it. But, the last episode didn't feel that bad, it was good compared to the ones just prior. I'd say it managed to make the end feel like an actual end without cutting the story halfway through.

Spoiler, click to view

rant: and Akaboshi coming back to life felt like complete bullshit, they made him give a goodbye speech to Milo just to bring him back after 2 episodes, honestly, this made me feel like those "goodbyes" are completely worthless

Solid story with great potential, a bit flawed execution. I wish there's a second season where all these flaws could be corrected and make something truly memorable.