You can get a love interest's confession when they reach 6 hearts. Talk to them before 11:00 AM on a sunny day and they will ask you to meet them later at Alan's tree.
Meet them under Alan's Tree at the Brownie Ranch Meadow in between 12:00PM and 12:50PM to see their confession. If you are show up any later than 1PM you will be considered a no-show and will lose hearts with them.
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Gill (ギル, Giru) is one of the available bachelors that you can marry in Harvest Moon: Tree of...