Sayonara comes from the 2017 visual novel Doki Doki Literature Club by Team Salvato. The track became closely tied to the game's infamous door-opening scene and spread through YouTube, TikTok, and meme edits as shorthand for emotional whiplash and hidden horror. Even people who have not played the game often recognize it as the music used when a cute or harmless scene suddenly becomes disturbing. Its staying power comes from how quickly it changes the mood without needing dialogue or a loud stinger.