Although Valentine's Day originated in the West and the custom of giving chocolate on Valentine's Day came from Japan, in fact, it was only in the middle of last century that Japan gave chocolate.

In 1950s, an American chocolate company first launched the Valentine's Day gift business in Tokyo. Unfortunately, Japan's economy was still very difficult that year, and only five chocolates were sold.

However, merchants are not discouraged. In the future, they will publicize this festival and promote chocolate around Valentine's Day every year. Chocolate merchants see the introverted and shy character of Japanese women, and on this day, they publicize that chocolate can be used for bold confession. Finally, the concept of giving chocolates on Valentine's Day is "deeply rooted in people's hearts".

Today, Valentine's Day in Japan is also called "Chocolate Day". In addition to girls giving their favorite chocolates to boys on February 14, the Japanese also created a "white day", which means that boys who receive gifts on Valentine's Day need to prepare candy and other gifts as a return gift one month later.

The chocolate merchant's strategy succeeded, and the custom of giving away chocolate spread overseas.