If you're looking for manga similar to Planetarian: Snow Globe, you might like these titles.
In the early part of the 21st century, clouds of toxic microbes cover most of the planet, forcing the citizens of Newport to wear masks when outside. In this harsh world, a single criminal's malicious deeds have incited the Japanese police to take to the street in Tanks! Having already stolen the experimental organism Greenpeace Crolis, Buaku and his henchmen Annapuma and Unipuma set their sights on bigger game including a prototype mega-tank and the governments only sand-crawler submarine. Join Leona Ozaki, Alcuad Solte, Charles Brenten, and the rest of the Newport Station Tank Police as they try to uncover the method behind the gangster's madness and catch him before his diabolical plan comes to fruition.
Humor is the only defense against insanity in a world where the crime is so bad that the cops need armored tanks! Such is the world of Leona, ace tank-cop. In her pet tank, Bonaparte, she'll either save the city of Newport. . .or destroy it trying! In No More Noise, Leona recruits some help to catch some slippery crooks—help that's rather crooked itself! The villainous and sexy Puma sisters become duly deputized officers of the law in this latest chapter of Dominion!
Haruka, the only known survivor of a cataclysmic global war, has taken refuge with a diverse group of sentient robots with distinct personalities. They attempt to survive in the desolate post-war environment; however their supplies are limited and the military robots are still active and hostile. Haruka remains optimistic that other humans may have survived the war, but their persistent search efforts have failed to locate any survivors. Is she destined to live her life without any human contact?
Louis, a 14-year-old “mecha-geek” who specializes in computers and all manner of hardware, adventures around a post-apocalyptic wasteland in a Dreadnaught tank along with the android-girl Mamet and teenaged ladies Liza, Wooty, and Mill. Though the Great War happened more than three decades pasts, the remnants remain everywhere, and the threat lingers that those who escaped to Mars might return to Earth to remake the planet anew, regardless of whether or not the remaining inhabitants agree. One of the greatest current problems is the atmospheric conversion system Z.P.T., which has gone out of control, but while seeking a solution to that problem there are war robots to be fought, treasure to be hunted down, lost tech to be recovered, and a sexy operative of the Anti-Martian Earth Self Defense Force to be dealt with.
In a ruined world, a human girl, Lu, and a droid, Zet, live a humble life. Then one day, they encounter a mysterious new droid, Chrome... Now all three of them live together like a family, but then…
In the future, 98% of the Earth's surface is a desert, and the few humans and androids that remain face eventual extinction. In the city of Abovesand, a boy named Rindt finds himself hunted by androids because he's the key to opening a mysterious box that the Ancients left behind. But he won't be taken easily, because Rindt has hired Handred, an android girl whose body contains 100 hidden weapons, to protect him!
After a decimating war against the androids they had built, humanity, though victorious, was forced to start living in shelters. There, they remained isolated from the wastelands of the rest of the world, created by the damage the confrontation brought to the world. Dr Gepetto, one of the brightest android creators of his time, died and left behind an inheritance of untold proportions, the only clue as to how to get it being a blue haired gynoid the old man had built and preserved for as long as possible even after his death. The gynoid was reactivated, and she's attempting to escape the grasp of the new government. And a hunt for the inheritance begins.
The human era has ended. This world is one where society has already collapsed.While people have slowly accepted the fate of their race, someone has started their journey: a girl and a dog. This tale, while a little lonely, is also filled with warmth. A slow life at the end of the world.
Time of EVE: Another Act explores wrenching emotional conflicts of high schooler Rikuo as he tries to make sense of a world in which androids match humans in terms of intelligence and emotions, and yet they are barred from forming relationships with humans. A mysterious strand of data in the activity log of Sammy, his family's android, leads Rikuo and his pal Masaki to a cafe called "Time of EVE," which blatantly challenges social mores by requiring that humans and androids be treated equally. Initially suspicious of the cafe, Rikuo and Masaki soon become regulars as they are charmed by the charismatic proprietress Nagi and get to know the other patrons. In this new environment, Rikuo comes to see to that androids are different from, but not inferior to, humans. And, he is challenged to confront a traumatic experience from his past...