I knew I had to sub this song considering it is one of my favorite songs of all time. I only ever found the 2009 version so I felt like someone needed to post the original one, which I think is much more beautiful in general. Enjoy!

Note: In the very last line, Mao sings "コバルト/kobaruto" but in the official lyrics it's "淡き群青/awaki gunjou" the title of the song.

Lyrics are from JpopAsia.com