Y/N and Chuuya Nakahara grew up together and never separated. They promised to never leave each other's side no matter what. Up until one day when Y/N leaves Chuuya behind and joins the port mafia. Their promise was still lingering as Y/N falls in love with Osamu. A year and a half passes and things seem to be normal. Well as normal as things can get in the port mafia. Then Chuuya shows up in Mori's office. Author's Note: This is my first story so I hope you enjoy! -Onyx (They/Them)