Underground River

"Underground River" is an insert song from the anime. It was composed by Kevin Penkin and features Raj Ramayya as the vocalist. It was played for the opening credits of the first episode. The lyrics are in English.

Lyrics
Travelling the aether back to you

To a land so far away

I feel the distance in between

A fragment of the world that used to be

Speaking through the river stream

Calling to me

Luring me down

Though I know just what I am

Who I could be is the mystery to solve

I shall find

The underground river's soul

Let it shine and let it glow

Let it shine

The underground

The underground river has shone