Parallel Line (Sayuri song)

"Parallel Line" (Japanese: 平行線, Heikousen) is a song performed by Japanese singer-songwriter Sayuri. It served as the ending theme song for the anime series Kuzu no Honkai (Scum's Wish). The song was released as a single on March 8, 2017, by Ariola Japan.

Thematically, "Parallel Line" reflects the complex and often unrequited relationships depicted in Kuzu no Honkai. The lyrics explore themes of longing, unreachability, and the emotional distance between individuals, mirroring the characters' experiences of loving someone who doesn't reciprocate their feelings or is otherwise unattainable. The concept of parallel lines, never intersecting, serves as a metaphor for these relationships, highlighting the persistent and ultimately unfulfilled desires of the characters.

The song is characterized by Sayuri's distinctive vocals and a blend of acoustic and electronic instrumentation, creating a melancholic and evocative atmosphere that complements the anime's narrative. Its popularity stems not only from its connection to the anime but also from its relatable exploration of universal themes of love and loss. "Parallel Line" is considered one of Sayuri's signature songs and a notable example of anime theme music.