They say the sun never sets on the Japanese empire, but they say this because they have only a vague understanding of history and some sense that there's a sun on the Japanese flag. They can safely be ignored. Which you fully plan to do; they've never brought you anything but trouble. You know the real expression is "if I go to Japan, no one will make me get a summer job." That's why you've decided to go to Japan for a month; that and the readily available porn.