This fun chirpy song, and you might think sweet too because of the title, isn't exactly what you think it is. Although it's nothing sad or dark, but it's a song about wanting to break up with their lover. The lyrics sing,Another cheery breakup song, emphasizes sunshower, which, as the name is, is when there's sudden rain during a rainy day. In this case, on a day when the weather is perfect, EPEX wants to meet up with their lover until the lover is seen with someone else.
Based on the title and how poppy this famous song is, you might think it's about a happy love song, but sadly, it's about reminiscing about your past love, not moving on after a breakup. After a breakup, you kind of need a pick-me-up song to cheer you up and make you forget about all the bad memories you had from the breakup. This song is exactly that.