That's where lone wolf detectives like Hiroshi Inaba come in. Unfortunately, half-human criminals means non-human clues that often leave the police stumped. In a world where half-human, half-animal chimeras live and work alongside normal people, there are sure to be a few bad apples in the bunch. Ganta must bet his life to survive in a ruthless place where it isn't always easy to tell friend from foe, all while trying to find the mysterious "Red Man" and clear his name, in Deadman Wonderland. The young protagonist is thrown into a world of sadistic inmates and enigmatic powers, to live in constant fear of the lethal collar placed around his neck that is slowed only by winning in the prison's deathly games. But Ganta's nightmare is only just beginning. Framed for the incident and sentenced to death, Ganta is sent to the very jail he was supposed to visit. However, Ganta's life is quickly turned upside down when his whole class gets massacred by a mysterious man in red. It looked like it would be a normal day for Ganta Igarashi and his classmates-they were preparing to go on a class field trip to a certain prison amusement park called Deadman Wonderland, where the convicts perform dangerous acts for the onlookers' amusement. It's up to him then to teach them and allow their emotions to grow, and when a nearby country threatens with world domination, it's up to to Otaru and his "human" Marionettes to protect their country. But one day, a ordinary boy named Otaru finds and awakens 3 special battle type Marionettes that have emotions due to a "Maiden Circuit" within them. However, they are all emotionless machines. however, there are still no women, and to make up for it they create lifelike advanced female androids called "Marionettes" which do everyday chores and work. Therefore, as to not let their efforts go to waste, they begin to set up 6 countries and to reproduce through cloning and genetic engineering. the remaining 6 manage to escape to a nearby planet named "Terra ll ", which is similar to Earth in many respects. However, one of the ships, the "Mesopotamia" malfunctions and all but 6 of its inhabitants are all killed. In the distant future, since the Earth has become overpopulated, efforts to find and colonize on other planets have begun. In spite of that, Chika chooses to charge forward and overcome the obstacles keeping her from forming a school idol group that shines as bright as the nine that came before her. Somewhat shy but a talented piano player, Chika believes her to be a promising recruit, though convincing her to join is easier said than done.
Just when it seems there is no hope, Chika meets Riko Sakurauchi, a transfer student from Otonokizaka High School, home of μ's. But even before gathering any students to join the group, the aspiring school idol finds her greatest obstacle to be student council president Dia Kurosawa who stands firmly against the creation of the club. Inspired by the former superstar school idol group μ's, Chika is determined to start her own school idol club in her seaside hometown at Uranohoshi Girl's High School. However, after a visit to Tokyo, she discovers a stage where even an ordinary girl like her could shine-the world of school idols. Chika Takami, a self-proclaimed normal girl, has never been involved in any clubs and lacked any notable talents.