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High school student Saya Toma (Erika Toda) lost her parents and younger brother in an airplane collision. Detective Akio Kondo (Yu Tokui) came and told her"the loved ones features a high probability that they were murdered by people who have spec." This was the very first time she heard of"spec". 6 years after determines to be a priest. After getting instruction by the FBI in the USA she returns. Saya Toma is delegated to work unsolved cases. Meanwhile, as a result of Satoshi Chii's (Yuu Shirota) scheme, Juichi Ninomae (Ryunosuke Kamiki) believes Saya Toma his parents' enemy and attempts to push her to the edge. The scheme of satoshi Chii has caused Juichi Ninomae and also Saya Toma to forget that they are sister and brother. The siblings are headed to a life-staking fight. A lady named Maho Ueno (Umika Kawashima) becomes involved in his or her struggle. To safeguard Maho Ueno, Saya Toma uses"spec".