Direct answer
Marriage in Starsand Island is represented by Move In: at five hearts the player asks a romance candidate to live with them, and there is no separate wedding ceremony or children system; Youfang is the only candidate who cannot be invited.
Direct answer
Marriage in Starsand Island is effectively the Move In option. Romance candidates are asked to move into the player's home at Heart Level 5, and the request is made by the player rather than happening automatically. The guides confirm there is no separate marriage ceremony and no children system yet, so living together is the endgame for eligible characters.
Not every character can be asked to move in: non-romanceable NPCs cannot be invited, and Youfang, though romanceable, is the only candidate who cannot move in with the player. The guides present this as an intentional exception for the monk character.
Reaching the five-heart requirement
Affection is raised through daily conversation (+5), gifts (loved items +15, liked +10), bulletin board requests (roughly +15 to +30), returning lost items (+20), and quests (up to +50). Heart levels unlock steps in order: around 90 points unlocks Gifting, 220 unlocks the group photo, 370 unlocks the room visit with the chest inside, then Requests, and finally Move In at level 5. The player must then actively ask, and needs space in the home for the new resident.
Because exact point thresholds differ slightly between guides, this page reports the pattern rather than a single authoritative table, and precise numbers remain Pending confirmation where sources disagree.
What happens when they move in
Once a character moves in, guides report they help around the farm: clearing debris, petting animals, watering crops, and walking around the home. A YouTube guide from Early Access adds that at five hearts the move-in resident will sleep in a bed the player places and that a mailbox invitation can trigger a private date quest with voice acting and subtitles. GameRant describes the five-heart move-in as helping with chores such as cleaning up, petting animals, and watering plants.
Limits and exceptions
The collected material says the player can reach five hearts with multiple candidates, but a non-bond character cannot be invited to move in, and Youfang is the lone exception among romance candidates. Upcoming My Time at Portia guests Gust and Ginger are reported as romanceable but unable to move in, similar to Youfang. The exact set of post-move-in behaviors, the presence of any voiced date quest in the final 1.0 build, and the full list of who can move in are treated as reported details, with anything not confirmed by official material left Pending confirmation.
SEO and source scope
This page targets Starsand Island marriage. Its metadata description is based on the same direct answer shown above, and all unsupported details are labeled Pending confirmation.
The supplied matching keyword material was used as the factual boundary for this page. Community discussion is identified as player reporting where it appears, rather than being upgraded into an official claim.