In Japan, the Valentine's Day is a holiday where women give gifts (the most common being cookies and chocolates) for men.

To be seen as something special and heartfelt, it has to be handmade. This one is usually made only for your loved one, and it's called the honmei chocolate (which translates to "true feelings chocolate"). And although it's not confirmed if it was only a hoax or not, it was trendy in Japan to talk about girls who wanted to feel more connected to their loved ones and to make them fall in love back, so they would make chocolates and mix their own hair, spit or even blood in the process.

Giri-choco (giving chocolates out of duty rather than love) is widespread, and girls will usually give chocolates not only for their loved ones, but for their fathers, friends, co-workers and so. (Some will do this for ulterior motives, but I'll talk more about it on White's Day).

With all the giri-choco pressure and the romantic ambience in the air, a guy who doesn't get any on this day is entitled to think that something's wrong with his social life as well with his workplace.