This quiz is a song title quiz of the singer's back number. (informal)
buck number is a Japanese singer-songwriter and artist with a high-pitched voice.
Her unique view of the world and lyrics that make you feel melancholy are attractive, and are supported by many people. Look at the beginning of the song and try to guess which song the lyrics are from.
If you're a true fan, you should be able to hit them all. Please try.