 "Secret" debuted at the top spot of the Oricon weekly chart with first week sales of 386,280 copies, outselling the number two album for a large 160,129 copies.However, its first week sales are about 263,000 lower than her last studio album "(Miss)understood" showed.This is because the "first week sales" of "(Miss)understood" were actually the sales of two weeks, as Oricon blends the last week of a year with the first one of the following year, making an Oricon Year with 51 weeks only.