Board Thread:News and Announcements/@comment-4698889-20180724122634/@comment-4698889-20180825062817

Lemmings has pointed out that the Song of the Third Period sounds like a graduation song, given its slow tempo and the fact that everyone is singing; here's an example.

I'd also like to point out that, aside from having a theme of moving forward, the lyrics mention the souls being gathered "under the third moon". My interpretation of this is that the song takes place in March, which also happens to be the time when graduations usually take place in Japan. To add to this, the twelfth word appearing at the end of the album crossfade is "graduation".