The original Korean version. Ark project is successful and humanity survives. Descendants come back to restore life on Earth with the DNA protected by the 'manager'. Art is slightly less detailed. You will find this version on other hosting sites.
Version 2-
Ark project fails and the DNA stored on Ark is destroyed. But the new version of the original system (robots) loaded in the mothership returns back to Earth and successfully manages to restore Earth's atmosphere. This version has detailed art but with 'extra' useless things added like Kira acting all cute and other shit.
If rated individually, I'd give each part:
Hotel - 10
Present - 8
Tuna - 9
Stephanos - 6
Diadem - 7
That averages out to 8, so that's what I give the whole volume.
Hotel - 10/10. I love the idea, it's just awesome.
Present - 8/10. The moment I realize about "slowing down metabolism" is great.
Tuna - 8/10. The alternative ending of Hotel. It was all for the tuna
that caused the humanity to survive.
Stephanos - 6/10. I don't know what is this about nor I want to know, actually I'd like to give it a 5 but the art is great. 6.
Diadem - 6/10. Okay, the art is good.
I love post-apocalyptic sci-fi, that's why my rating is biased.
Really love a such a short story can stick with me for so long giving me deep existential feels. First read it years ago and forgot the name. Hear I am all this time later, and still, the feels hit as hard as they first did.