Ginjirō Manda reigns as a feared loan shark in Osaka's Minami district, imposing the crushing "toichi" interest rate—an additional 10% every 10 days, equivalent to 365% annually. His relentless and dreaded debt collection tactics earned him the moniker "Minami no Oni," the Demon of Minami. He consistently thwarts borrowers attempting scams or planned bankruptcy, enforcing repayment through complex financial countermeasures.

Manda leverages affiliations with multiple Osaka yakuza gangs as part of his operational network. His professional activities involve confronting defaulting borrowers, such as failed AV producers, and navigating intricate scenarios with stockbrokers and yakuza interference to recover debts.

The character originates from the manga "Minami no Teiō," serialized since 1992 in Weekly Manga Goraku, with 182 volumes released by April 2025. A prequel, "Minami no Teiō: Young-hen" (2006-2013), explores his earlier years, including storylines involving "Riken Kūkō" (Profit Airport).

Adaptations include two OVA episodes (1993, 1994) depicting his debt collection and confrontations, and live-action television films like "Nanba Kin'yū-den Minami no Teiō Tokubetsu-hen Mitsuyaku" (1996) and "Shin Minami no Teiō" (2010).