I don't get why you think this is uniquely Japanese. Do you think western Valentines Day and diamonds aren't equally the result of marketing campaigns? Diamonds

I don't get why you think this is uniquely Japanese. Do you think western Valentines Day and diamonds aren't equally the result of marketing campaigns? Diamonds as a wedding ring was not the norm in the 1800s. Engagement rings a nonsensical idea until recently. And Valentines Day does not have particular cultural or religious significance in the west. Christmas, sure. But not Valentines day.