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White Day

White Day (March 14) began to be celebrated in Japan in the 1970s as a day when mainly men would give gifts to the women who gave them chocolates on Valentine’s Day. They generally give cookies, candy, or some other kind of sweet.

Reference site
「日本文化いろは事典」
http://iroha-japan.net/iroha/A01_event/06_wd.html

Related site
Valentine’s Day
http://www.tjf.or.jp/clicknippon/ja/365/event/valentine/