Volume one of Usogui was released on September 24, 2006.
Madarame Baku meets Kaji Takaomi at a pachinko parlor. Little does Kaji know that Baku isn't just a run of the mill gambler. After helping Baku win 100,000 yen from only 1,000 on slots, Baku offers to buy Kaji food. Kaji declines gratefully, but before he can leave a pair of loan sharks comes after Kaji. Baku pretends to be a loan shark and saves Kaji from more harassment, and in exchange decides that he'll help Kaji pay his debts instead. They become friends after a few ordeals and soon after, get caught up in a life or death gamble.
|Volume One | Volume Two | Volume Three | Volume Four | Volume Five | Volume Six | Volume Seven | Volume Eight Volume Nine | Volume Ten | Volume Eleven|
|2||"Eating Illegal Loans"|
|3||"The Personal Information Trap"|
|5||"The Value of Things"|
|6||"The Abandoned Building Game"|
|7||"Everything is a Gamble"|
|8||"The Spirit Breaks"|
|9||"The Pleasure of Murder"|