Rin Hojo, also known as "Shinigami", is Go Hojo's elder brother and a legendary driver of Kanagawa. Rin has had a long-standing feud with Ryosuke because of a girl named Kaori, who was Rin's arranged fiance at the time.
Kaori would commit suicide after Rin verbally abuses her, claiming that she'll regret rejecting him when she and her family will be ruined. After this event, Rin left the racing scene and became a recluse, locking himself in his home for years, before making a surprising return and racing (unofficially) against Team Spiral's leader, Ikeda. Rin is an extremely skilled driver who utilizes a dangerous driving style
(Source: Initial D Wiki)