AFnord: I would very much appreciate White Day, but as I already celebrate Pi day, having another day on the same day would just be confusing.
*edit* Oh wait, I should have read the wikipedia entry more carefully. So white day is about men giving women candy? Then I much prefer Pi day (not that I would have anything against making sweets for someone else, I just don't like to be forced to do it).
On White Day, the reverse happens: men who received a ‘honmei-choco (chocolate of love)’ or ‘giri-choco (courtesy chocolate)’ on Valentine's Day are expected to return the favor by giving gifts. Traditionally, popular White Day gifts are cookies, jewellery, white chocolate, white lingerie, and marshmallows.
It sounds like returning the gesture of love.