Erika Toda
Saya Toma
Ryo Kase
Takeru Sebumi
Saki Fukuda
Mirei Shimura
Yuu Tokui
Akio Kondo
Tetsushi Tanaka
Toshiaki Reisen
Yu Shirota
Satoshi Chii
Kohki Okada
Kaoru Baba
Kazuyuki Matsuzawa
Ayumu Shikahama
Ryuji Sainei
Souji Inomada
Takeshi Ito
Yusaku Shimura
Ryunosuke Kamiki
Juichi Ninomae
Raita Ryu
Kotaro Nonomura
High school student Saya Toma lost her parents and younger brother in an airplane accident. Detective Akio Kondo came and told her "your family has a high possibility that they were killed by people who have spec." That was the first time she heard of "spec". 6 years later, Saya Toma, who has never forgotten what the Detective said, decides to become a detective. She returns to Japan after receiving training by the FBI in the United States. Saya Toma is assigned to work unsolved cases in the Public Security Bureau. Meanwhile, because of Satoshi Chii's scheme, Juichi Ninomae considers Saya Toma his parents' enemy and tries to push her to the edge. Satoshi Chii's scheme has also caused Saya Toma and Juichi Ninomae to forget that they are brother and sister. The siblings are headed to a life-staking fight. A girl named Maho Ueno becomes involved in their fight. To protect Maho Ueno, Saya Toma uses "spec".
