Haruo Sugimura is fresh from serving a two-year stint in prison for assaulting someone when he is recruited by a loan shark named Sakai to help collect money for a company called Minami Hachi Ban Kogyo, baesd in Osaka. Their rates are ruthless: 10% interest is added every 10 days. Their customers are desperate: a hostess who owes money to other loan sharks, a man made suicidal because his family don’t love him anymore. Haruo learns about the art of the loan shark as well as the dark side of peoples personalities.

Tadaomy Ando became a yakuza boss at a young age. Because of his subordinate, he quit the yakuza. Now, he learns from Takashi Konaka the trade of illegal money lending and how to collect debts. Tadaomy Ando decides to become a loan shark. He has customers, but has a hard time collecting debts.

Tadaomy works as a loan shark. He hires Tukasa to work for him. One day, Tadaomy’s debtor, Okabayashi, asks to borrow two million yen more. Tadaomy trusts Okabayashi who has payed back sincerely, but Okabayashi suddenly disappears.

Tukasa works for Tadaomy’s loan shark company. He picks up more female debtors because of his appealing looks. One day, Erina appears in front of Tukasa. Erina used to be an idol and she now sings on the street.

When a friend from his yakuza past gets released from prison, a loan shark and his former-male-host sidekick help the ex-con get back on his feet.

The Japanese political and business world where Chimimoryō is in control. Ginji (Kiyoshi Nakajo), a man who won the fierce competition and built a huge fortune. A new enemy appeared in front of him. Former President of the Liberal Democratic Party, Kawai. He has requested the Japan Horse Racing Promotion Association for 30 billion election funds for the next presidential election. Ginji first brought in a young man named Ryohei, who has an outstanding memory, who remembers all the results of the 10-year race. In order to defeat Kawai, he uses his memory to make a trick.

A man Tetsuo (Kosuke Toyohara) met at a racetrack offered him a job of 100,000 yen per diem, and although he was suspicious, he was urged by the amount of money and decided to take over. What's more, all he has to do is carry a huge cardboard box to the man's apartment. The contents of the cardboard are 1 billion yen in cash. It is said that this will be used to make a back loan. In front of the apartment, men line up for the money. Who on earth is Ginji Hirai and what is his motive? And what kind of fate will Tetsuo be involved in from now on ...?

Tetsuo was suddenly told goodbye by Ginji. As for the farewell, only one of the tables was a real wad of bills and a full trunk. And, in that, there is a letter saying "Replace all this with the real thing!" Tetsuo is at a loss and one day meets Emi who works at the gallery. She endures the gallery owner of an amorous artist and aspires to be a painter. Tetsuo learns from her that a painting of Cezanne with a market value of 600 million yen has been sold to a Japanese person, and contacts the owner, Domon, the president of Teijin Bank. Inspire the desires of collection enthusiasts and imitation art dealers, and come up with a large-scale money game that opens up ambitions!

Mirai Suzuki (Yuko Oshima) becomes responsible for her mother's debt which is owed to loan shark Kaoru Ushijima (Takayuki Yamada). To begin paying off her mother's debt, Mirai begins working at a dating cafe. Meanwhile, Jun (Kento Hayashi) is the ambitious and greedy company president for an event group. To borrow money, Jun visits Kaukau Finance owned by Kaoru Ushijima.

Shoji, who moved to Tokyo from Tohoku, meets Daisuke by chance and hits it off. Hoping to make quick money, the two join forces with the yakuza and start a loan shark business, lending money at exorbitant interest rates. Shoji is strong-willed and ruthlessly collects from debtors, while Daisuke is timid and unable to be completely ruthless. Despite their polar opposite personalities, the two get along surprisingly well, and their loan shark business is going smoothly. One day, Shoji is approached by Narimatsu, the boss of a gang, who is like a leader to him, to join the yakuza. Meanwhile, Daisuke discovers that his girlfriend Maika is in debt. With the money from Narimatsu's gang, Daisuke and Maika disappear.

Ushijima runs Kaukau Fiance, a black market lending agency which scourges its clients with interest rates as high as 50% for 10 days. Ushijima chases down his debtors, who normally come from the bottom of society, with ruthless efficacy.

A classmate from Ushijima's middle school days, Takemoto, shows up. He was a kind man, but now is jobless and without a home. Adrift and unable to borrow money from Ushijima, Takemoto heads for Seiai Home where he can stay while doing work.