Based on a popular game from Niconico.
Sara Chidouin returns home from school late one night to discover that something's gone terribly wrong.
When she comes to, she finds herself, her friend Joe, and 9 other people trapped in a mysterious place.
Placed in life-and-death situations, they must come to an agreement about what they should do - and who should die.

Armitage the Third borrows heavily from both Blade Runner and Total Recall to present a humans vs. androids murder mystery set on a Mars of the future. A four-part OVA series was released beginning in 1994, and this manga utilizes the same main characters and setting yet with a slightly different plot line. Copies are exceedingly rare even in Japan.

Okabe Rintarou, the mad scientist of chaos, invented a time machine and disappeared. He goes to through the world line trying to unravel secrets....what awaits him? More trouble?