Hello there! Allow me to present you a story full of suspense, endangered humanity destroyed by it's own hands, barren lands and chuunibyou drivel. Allow me to present you... "The story that was totally not inspired by trigun and you should totally read it because it's worthwhile".
Honestly, there's so little that's different about the story that if I told you the differences that'd be spoilers because you know what'll happen next.
Characters are... good (and familiar), the world is very consistent in it's postapocalyptic feel (hey, I heard it somewhere else...), and even the narration will make you check twice if you're actually reading a new manga. It's good, but because it's inspired by something exceptional, and about only original input I managed to find was the teenage rambling like"Finding me in the darkness, the heavins cry and you sit on the balcony".
>>>PEOPLE CARING ABOUT THEIR TIME MORE THAN MY TANTRUM READ FROM HERE<<<
All in all, the story was interesting and fun to read, but so unoriginal that personally I'll never read it again. It's a good and enjoyable time killer, but not much else. You won't be enriched, suprised or anything after reading it. So, yeah, if you already read all the better manga and still have too much free time, give this one a go.