Quick answer
There are no save-transfer rules because no public demo has been announced.
Evidence checked
- No verified demo currently creates transferable progress.
- The trailer does not describe a trial-save system.
- No preorder reward is tied to demo completion.
What this does—and does not—confirm
Farm, character, item and settings carry-over claims are unsupported until Natsume publishes a demo and its rules.
This answer covers Harvest Moon: Echoes of Teradea only. It does not copy schedules, gifts, values, controls or mechanics from earlier Harvest Moon games.
Evidence source
Official publisher announcement: Natsume first-trailer announcement — June 18, 2026. Independently summarized and checked on 2026-07-26.