How do you get the blue feather in harvest moon ds cute?

you have to get your persons heart up to it least orange then you can buy the blue feather at the supermarket once the person's affection is at least 50,000, the blue feather will become available at the supermarket(you can find out the affection the person has toward you by getting the love ring at the Sprite casino.) the affection needs to be 60,000 so you can propose