Sugar song to bitter step

"Sugar Song to Bitter Step" is a popular song from the anime series Kekkai Sensen. It is performed by the Japanese duo Unison Square Garden and was released as a single in 2015. The song was composed by Tomoya Tabuchi and written by Tachiko Nakanishi. It serves as the ending theme for the first season of the anime. An interesting trivia about the song is that it was used in a commercial for the famous chocolate brand Kit Kat in Japan. The melody of "Sugar Song to Bitter Step" is upbeat and catchy, blending elements of pop and rock music with expressive vocals and vibrant instrumentation.