ORICON combines the last week of the year with the first week of the next year as they go on holiday for New Years. As a result, they only have a 51 week chart year.
In the case of "GUILTY", Hamasaki Ayumi did infact place at #1 for the first week of the double week according to the figures from the United World Chart/Media Base. However, officially she did not get number one because Kobukuro overtook her sales during the second week and she ended up at #2.
This is the same thing that happened to Kumi. Her single came out in the first week of the double week, had enough sales to score a #1, but was overthrown by bigger sellers in the second week.
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"Put your hands up together! Keep your hands up together! Let me sing forever!"
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