Fuji Television screened a popular TV series in 2009 called "Ninkyo Herupa" ("Yakuza Helper") that focused on the life of a former gangster who landed a job at a nursing facility for the elderly.
Over the course of the series, he learned to follow the values that all gangsters claim to hold dear: help the weak and stand up to the powerful. It's a nice idea, although quite obviously fiction.
The reality is naturally much more complicated, and experts say that former gangsters typically have a hard time reintegrating into society once they decide to abandon their ties to organized crime.