Atsuhisa Yamada is an ordinary man, with a wife and a 5-year-old daughter. He is close to his childhood friend Takeda. One day, Atsuhisa Yamada leaves his office during work hours and goes back home early. There, he witnesses his wife and an unknown man having sex, but Atsuhisa Yamada is unable to express his feelings like anger, frustration, and depression. His relationship with his wife and his friend Takeda becomes distorted.
Tsukasa Kobayashi has the appearance and educational background of an elite and earns a good salary, but he is actually incompetent at his job and makes mistakes frequently, earning the ire of his co-workers. Tsukasa was about to quit his job after much humiliation at work when he learns that his wife is pregnant.
Without an official spy organisation, Japan is seen as a hotbed for crime by foreign and domestic criminal groups. K13 is a unit established within the Tokyo Metropolitan Police Department to combat this situation. The activities of K13 are known only to a few people and its members do not exist on record. Led by the top agent code named Mirage, K13 members target not only brutal crimes but are also given secret missions to handle crimes which cannot be solved politically and socially. Meanwhile, there are people who intend to set up a police organisation like the FBI in the US and strengthen the Japanese police by enacting a bill to expand its powers. Before long, the K13 gets embroiled too and a huge conspiracy is revealed.
Towards the end of the Edo era, in the town of Kyoto, there lived a wealthy merchant by the name of Imai Tadamasa. He was blessed with 3 children, Hatsu, Asa and Kyutaro. His eldest, Hatsu, was a traditional girl who loved to play the koto and sew. Whilst his second daughter, Asa, was an impish hoyden who loved sumo wrestling. Asa was engaged to be married to the second son of a distinguished family who ran a money changer business in Osaka, Shirooka Shinjiro. Although Asa was furious when she had first heard about the betrothal, when she met up with Shinjiro for the first time, his charisma greatly attracted her and she fell in love with him in no time.