Planetarian

Alt title: Planetarian: Chiisana Hoshi no Yume

If you're looking for manga similar to Planetarian, you might like these titles.

Dominion

Dominion

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.

I agree

Kurogane Communication

Kurogane Communication

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?

I agree

Dominion: Conflict One - No More Noise

Dominion: Conflict One - No More Noise

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!

I agree

Heart Gear

Heart Gear

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…

I agree

Android Type One

Android Type One

I agree

Gepetto

Gepetto

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.

I agree

100 -Handred-

100 -Handred-

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!

I agree

Junk Force (Light Novel)

Junk Force (Light Novel)

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.

I agree

The Flat Earth/Exchange

The Flat Earth/Exchange

In a world where humans and androids co-exists, the human population is rapidly declining. As part of a plan to preserve the species, high school student Kotaro Shiga is placed into a state of suspended animation. Waking up a century later, he finds a very changed world where androids are in charge and humans are very scarce. The Androids, whose memories only extend back 22 years, have rewritten history and believe it is they who created humans. With the help of an exiled human prince and an android distressed by his own limited memory, Kotaro is out to awaken his fellow "sleepers" and teach the world its true history.

I agree

Demokratia

Demokratia

A secret social experiment is led by two Japanese engineers, having an android every move, expression and decision decided through a majority vote from a collective of ca. 3000 randomly chosen people. The vote system offers the opportunity to any member of the collective to set forward his/her proposition. The 3 most proposed actions as well as two propositions made only once are submitted to the majority vote.Rules and systems have been set to ensure the dynamism of that community, and to prevent identification of people and places where the android evolves in modern-day Japan. And so the Dēmokratía android came to life.

I agree