Sugar Song to Bitter Step

is a song covered by Hello, Happy World!

It was originally sung by UNISON SQUARE GARDEN and used as the ending theme for first season of Kekkai Sensen.

It was the VS Live song for the Worldwide and Chinese servers' run of the event Always Halloween For Kokoro!, replacing Hanamaru Pippi wa Yoiko Dake. It was also one of the challenge songs for the event Winter Sky Marché.