Can't find an old song

[Found!!] https://youtu.be/RGldHOOSkMo

Hi there,

I played this game with a friend a few years back, and while I wasn't very good I loved the music. There was a particular song that I really liked that I cannot remember the name of. The youtube video I had of it was in a playlist, but it appears to no longer be available. The song was sung by a woman. It was moderate-low speed, but generally played sped up. I remember it was about time passing, and had one lyric about walruses. It was in japanese. The image was a girl sitting in a chair (I think?) while pages flew around her and into the sky. I know this isn't a lot to go off of, and I'm sorry, but does anyone remember the song?

Thanks for the help, and lmk if I should post elsewhere instead