Filii Bestia

Character song of "Cassius", which ranked first in the smartphone app "Phantom of the Kill" 2019 character popularity vote.
The song "Filii Bestia" sung by her who controls the land of the fantasy beast "Traysema Republic" is a conceptual song with a theme of "salvation" different from conventional character songs. It features a mysterious tone and melody, and expresses the character of Cassius with a beautiful and transparent voice. The coupling song "Eternal Winter..." is a song that arranges the 2019 Phantom of the Kill summer theme song "Eternal Summer..." into a solo version of Cassius. It was changed to "Winter" and the lyrics and rhythm were completely updated. The lyrics are words about Cassius and the Phantom of the Kill, expressing unrequited love and winter sorrow. It is written in consideration of the change from the summer lyrics.