Japan is big on seasonality. As you might deduce about a society that has preferred points of the calendar for eating specific snacks and sushi, this extends to romantic relationships as well. Like the blossoming of the cherry trees, each year sees certain repeating situations for which popular opinion holds the best way to spend is “with your boyfriend.”
However, not every woman in Japan has a special guy in her life, which can be all the more of a downer when you keep hearing about how romantic those particular times of year are.