The Great Collapse Era. In the near future, civilization has collapsed due to a large-scale disaster and war, and has one foot in the apocalypse. Detective Zoe, a young girl struggling to maintain security, gets caught up in mafia trouble and saves an elderly woman. But then a giant puppet weapon released by the Mafia's pursuers appears. Meanwhile, the old woman also has some kind of disturbing secret...?

Ayako and 40 of her classmates are suddenly blown to another world by the power of a God. There, they are have to fight against zombie soldiers…. Ayako goes through various warring departments, such as assault soldiers and sanitary soldiers, hoping to speed the fight and go back to the former world!

Koharu is in training to become a warrior goddess, but lately she's been restless. Being raised in a Goddess Palace means she's never seen men before, and like most 15-year-old girls, she has a keen interest in them. After finally escaping to the outside world, her superiors agree to let her stay there under supervision. But a showdown with Yusemi, the evil force that Koharu is destined to face, looms.