A series of grotesque murder cases takes place on rainy days. Detective Hisashi Sawamura (Shun Oguri) works to catch the murderer like he has done with past cases, but he soon realizes the murderer’s next target is his wife and son. A man in a frog mask is a suspect.

Set in the late 21st century, an MRI scanner is introduced at the National Research Institute of Police Science’s 9th Forensics Laboratory. The machine is able to scan the memories from even the deceased. As ethical questions arise over the machine’s use, the 9th Forensics Laboratory members, including rookie Ikko Aoki and Chief Tsuyoshi Maki, struggle to solve cases.

Shishio has set sail in his ironclad ship to bring down the Meiji government and return Japan to chaos, carrying Kaoru with him. In order to stop him in time, Kenshin trains with his old master to learn his final technique.

Kenshin has settled into his new life with Kaoru and his other friends when he is approached with a request from the Meiji government. Makoto Shishio, a former assassin like Kenshin, was betrayed, set on fire and left for dead. He survived, and is now in Kyoto, plotting with his gathered warriors to overthrow the new government. Against Kaoru’s wishes, Kenshin reluctantly agrees to go to Kyoto and help keep his country from falling back into civil war.

Former legendary assassin Kenshin Himura has now become a wandering samurai. Offering aid & protecting those in need as atonement for his past deeds. During this time Kenshin Himura comes across and aides Kaoru Kamiya (Emi Takei). Her father opened the Kamiya Kasshin-ryu, a kendo school located in Tokyo and Kaoru is now an instructor there. Kaoru then invites Kenshin to stay at her dojo. Their relationship develops further, but Kenshin is still haunted by his violent past …