Close to Home

Close to Home is the final part of the main quest and achievement/trophy in the Fallout 4 add-on Far Harbor.

Detailed walkthrough
The Sole Survivor will talk to Kasumi Nakano in Acadia and convince her to stay or go back home. When talking with Mr. Nakano, the Sole Survivor will be rewarded, unless the player character refuses to take it or if Acadia was destroyed (including Kasumi).

Bugs
When trying to collect the reward from Kenji's stash after bringing Kasumi home, the screen will fade to black when you select the "Dig" option, but will be stuck loading with the player unable to use controls. The only known way to fix it is to reload a save.