Narumi Katou is a middle-aged man who suffers from the bizarre ZONAPHA Syndrome: a rare and inexplicable disease that causes its victims to endure severe seizures at random, with the only cure being to watch someone laugh. One day, during Narumi's part time job, a young boy with a giant suitcase fleeing from three adults runs into him. The boy introduces himself as Masaru Saiga, the new owner of the famous Saiga Enterprises following his father's recent death. However, other members of his family are trying to assassinate him and claim the fortune for themselves. Determined to save the child, Narumi helps Masaru escape and ends up fighting the pursuers, only to discover that they are sentient humanoid puppets with superhuman strength. As Narumi is about to lose, a white-haired girl suddenly joins the fray and swiftly summons yet another puppet from the boy's suitcase, claiming herself to be Shirogane, Masaru's guardian. Karakuri Circus follows three people from different backgrounds whose fates intertwine and diverge as they unravel the mysteries of an ancient tale of love and betrayal, and the long, ancient battle between humans and puppets.

Centers around a girl named Akomi and her boyfriend Ponta Ninomiya. Ninomiya is a massive idiot who has no redeeming qualities aside from being really handsome. Follows the couple's everyday lives. (Source: ANN)

It is the time of civil war. Zipangu is a country where people live together with gimmick warriors, a kind of super human robot. There, people and gimmick warriors struggle to seize power. Musashi, a Samurai gimmick warrior, departs to on a quest to become the best Samurai warrior. Musashi thrives in the series of battles, encountering with many heroes and villains including his lifelong rival, Kojiro, an expert swordsman. Later, Mushashi and Kojiro are sent by their General to escort the Princess, a granddaughter of the general. The princess is spoiled and difficult, so their journey becomes series of misadventures. Soon, they are caught up in a battle to seize control of the Country.

The world of the humans and the world of the demons (youkai) have overlapped one another, leaving humans to walk the streets of life as they normally would, while demons walk, hidden from the naked eye, down the very same streets. A seemingly young woman named Yurine and her servant, the Karas (from the Japanese word for Crow), have long maintained order and balance between the overlapped worlds, ultimately keeping the demons from interrupting the lives of humans. However, humans have come to forget and jest at the existence of demons, and no longer understand the privilege it is to live without fear. Disgusted by this arrogance, an old Karas turns his back on the laws he had once upheld, and in his human form, named Eko, he creates an army of Mikura, or mechanized demons, to ready an attack on the human race. A young man named Otoha inherits the powers of the Karas and takes his place at the side of Yurine, who claims that his soul called out for her while he lived the life of a human. They live in the world of the demons. It is now up to Otoha to prove himself as a Karas, and restore the balance that Eko threatens to upset. Meanwhile, a superstitious police officer named Sagisaka and his rational new recruit, Kure, follow the trail of the murders dealt by Eko's Mikura, as well as the trail of a rogue Mikura named Nue. The prophecy unfolds from here into a grave revelation for all in the city. (Source: Wikipedia)