chikyuu_no_ura_(cevio)
A song by iyowa (igusuri please) featuring Rime (cevio). The music video features a cat girl speaking to the listener as they continuously descend via elevator, speeding up as the song progresses.
Chikyuu no Ura is a musical and thematic complement to iyowa (igusuri please)'s other song Isei Ni Ikou Ne (cevio).