Valentine's Day and White Day in Japan

In Valentine's Day sales of chocolate pick up considerably in Japan.
Nothing surprising ?
Maybe so if it were both boys and girls who receive chocolate.
Actually it is especially for boys.

Another proof of Japanese macho society ?
Not in this case.

Valentine's Day was incorrectly introduced in Japan :
girls don't propose a date usually, but on this day they have right to declare love by presenting chocolate.

They say it was a strategy by chocolate manufacturer.

In any case it worked.

Candy manufacturers didn't wait to revenge.

They invented "White Day".
A boy who got chocolate from his love has to give her candies one month later.

White Day has such a big success that in high schools boys can be blamed by girls for not giving candies in return.