Maroushinshi B.T.

Takes place 60 years after the events of Mashounen B.T. and stars an older B.T. and Koichi Mugikari.

Koichi falls for a scam from the "Outlaw Guys" and loses his house and retirement money. Ostracized by his family, Koichi can only rely on his childhood friend, B.T., to help him get payback.

(Source: JoJo Wiki, edited)