A cut from the full song to fit the clip from the first episode of the anime.
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EDIT: Added English Subtitles from the English WIki (https://projectrst.fandom.com/). I changed the last line because it seems to fit more that way.

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Lyrics:
Break down to sing a song to you
Break down free to be born again

Toki wo koete tsukamitoru yumemite chotto mirai wo egaita’n da
Ai wo watashi nari ni sagashite ita’n da zutto mitsukeru made eien ni

Aitakute tomerannai shoudou ga hageshikute mune wo utsu kara
Takanaru kodou ayumu sono saki ni hora

Yume wo misete todoketakute afuredasu omoi hakidashite
Uketomete yo ne watashi no kono koe
Doko ni mo nai kono keshiki wo itsumademo misasete konomama
Mezameta kono tsubasa wa kimi wo mezashi
Habataku

MAG.MOE - The MAG, The MOE.