BABYMETAL DEATH!

Here is a BABYMETAL mythology: Su, the lead singer, died as a normal school girl on the cross and was reborn as an agent with a mission to restore the glory of metal music to our world. The neck brace is a symbol of heavy metal. Wearing it means to wear the mantle of metal music. Think about it as a story in a musical theater.

Another important fact is that the song title is "BABYMEAL DEATH (DESU)", which is a word play on Japanese and English words. Since Japanese language does not have "th" sound, they replace "th" with "su" and pronounce "death" as "desu". Now "BABYMETAL DESU" in Japanese means "[We] are BABYMETAL", a self-introduction. So, the whole thing means this. We are BABYMETAL. Our mission is to revive metal music. We sacrifice our normal life (we work very hard) for the mission. That's BABYMETAL and that's who we are.