While Kadokawa Games release tomorrow the new PS Vita game the Reco Love Blue Ocean / Gold Beach the gift DLC which is included in the pre-ordered package version will be available later.
According to the today released information, the school gym costume DLC will be available only from October 31, 2016 and it is true for the selected stores limited DLC gifts such as from the Sofmap for example.
The reason of the delay not published.