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Tanabata, of course, is a pink gift box for my girlfriend, because Tanabata is Valentine's Day. On this day, you must express your love to your girlfriend. It is more appropriate to send a pink box, because girls generally like pink tender things, and pink suits his personality. He will definitely like it, because pink generally represents love, and you can just give it to him to express your feelings.
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It is better to send a pink gift box, which is more girlish. Girls don't like black very much. Black is too dark.