According to Japanese lore, when people die, their souls take the shapes of Black Swallowtail Butterflies and fly to the next world. So when this guy sings that he wants to become a Black Swallowtail Butterfly, he's actually singing about how much he would like to die instead.
![Cover art for 19 sai (19 Years Old) [English Translation] lyrics by Suga Shikao](../../../images/art-default.webp)
According to Japanese lore, when people die, their souls take the shapes of Black Swallowtail Butterflies and fly to the next world. So when this guy sings that he wants to become a Black Swallowtail Butterfly, he's actually singing about how much he would like to die instead.