Kuroi Gashu: Kusa

Kagura Akane is the only daughter of a family who runs a teppanyaki place in downtown Tokyo. Akane had always been proud of her father Tetsuma, who was called the "No.1 teppanyaki chef in Japan." Growing up in such an environment, she naturally acquired "teppanyaki skills." However, when her mother died of illness, her father lost his energy to work and disappeared. Since then, Akane has managed and protected the restaurant all by herself. One day, out of the blue, she is visited by Erena, the rich daughter of a major food company, who orders Akane to move out at once because her father had borrowed money against his restaurant. Though feeling disappointed, Akane makes up her mind to close the store. But when her father's friend, Kurogane, shows her "Ittetsu," a grilling plate that Akane's father cherished, it reignites her passion towards teppanyaki.

Akiho Takeda is assigned to #3 investigation team for The Tokyo Metropolitan Police Department. On her first day at work, a burglary takes place at a jewelry store in Shibuya. The case though is taken by the #1 investigation team which Akiho hoped to join. Nevertheless, Akiho goes secretly to the jewelry store where the theft took place. Later, a safe at a jewelry store in Roppongi is broken into. Stolen from the safe is the diamond called "Besu". The "Besu" is one of three diamonds that makes up the "Kuraida Family's Three Sisters". The other two diamonds are "Ani" and "Kyasari". The diamond "Ani" was stolen from the jewelry store in Shibuya, that occurred a few days earlier. Several people believe the two diamond thefts were done by the same person(s), but Akiho mentions the techniques used by thieves are different. Yet, Akiho believes there must be a connection between the two cases.

Kumiko Yoshikawa joins the Big Wing company at Tokyo International Airport. It's her first day and she is full of enthusiasm, but that leads her into trouble.

Kintaro Yajima comes to Tokyo and is hired by Yamato Construction Company when he saves the life of the company's CEO. A former leader of a motorcycle gang, Kintaro is known for his highly principled and forthright way of dealing with matters and is never afraid to tell his superiors exactly what he thinks. This has a tendency of irritating some; but when corruption from within the company begins to surface, he may be the only one who can stand up to it.