"Welcome to the story of the song." A virtual singer who spins songs. This song was composed by Yumemi Kujira, who has also worked on theme songs for anime works, and lyrics by Tsumugishachi, who is also active as a vocalist.It is a song that strongly expresses a sad worldview. Ruri Enma's sad inside singing voice and delicate, rich expressiveness invite you to the story of the song.