It's just a glitch.
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At Gray's Shop
There are no characters named Nina and Galen in Harvest Moon: Boy & Girl. Nina and Galen appear in Harvest Moon: A Wonderful Life, Harvest Moon: Another Wonderful Life, Harvest Moon: A Wonderful Life Special Edition, Harvest Moon DS, and Harvest Moon DS Cute.
Wrote Harvest moon at the house of Mike Wolf, owner of Mikes Train House,story goes he was on the porch at night and there just happened to be a harvest moon, and wrote the song.
yes you can
You can see Gray by using the phone in your house to call the Blacksmith shop when it is open. To actually meet him you will need a DS with a GBA Slot and a copy of Friends of Mineral Town or More Friends of Mineral Town. Insert your Mineral Town game into the GBA Slot of your DS and play Harvest Moon DS Cute like normal. Gray will visit every Thursday and on certain festivals.