Verified summary
Official development material connects berries to Aurora: joining her breakfast can improve the relationship and provide a special buff after Fiona eats the berries. The exact buff statistics are not public.
Confirmed details
The summary above is supported by the linked official store page, developer update, or Prologue patch record. The page keeps the source context visible because development information, public Prologue behavior, and final-game behavior are not automatically identical.
How this connects to gameplay
Neverway connects life simulation, relationships, food, time, combat, and story progression. This entry is useful because it identifies the concrete interaction and points to adjacent systems without inventing a complete item table, schedule, recipe list, or optimal strategy before those can be tested.
What is not confirmed
Only the named behavior and facts in the summary are confirmed. Exact numerical values, hidden triggers, final prices, complete schedules, romance requirements, drop rates, rewards, and final-build balance remain outside the index until an official source or direct game evidence supplies a specific answer.