アルルカン (Arlequin)-白死蝶 (Hakushi Chou/ Byakushi Chou) romaji& eng sub

English title of the song: The Butterfly Becomes Pallid and Dies

The song title could be pronounced as Hakushi Chou or Byakushi Chou. Anyone knows how the band says this song?

p.s. The symbol of a butterfly: https://crystal-cure.com/protection-butterfly.html→the song title: the happiness is gone