What is Gin and Matsumoto's relationship in Bleach?
With regards to Gin and Rangiku's relationship, the anime does not significantly deviate from the manga. I do not recall all the details of every chapter, but the Bleach wiki pages for Gin and Rangiku does not mention anything different from the anime.


   Given how Gin spent 100 years and even betrayed Soul Society to get revenge just for making Rangiku cry, it is very unlikely this was "just friends". Likewise, Rangiku seemed to be having feelings for Gin, though there is less evidence of that.