But you'd think that for an era ending, (aka the fact that everyone is like "this is the end of the link to the past mm ;-;") they would put sayu all over it, which they did, but not in one of the songs.
but, I guess if you think about it, it's as if Mikaei Bijin is a B-side, like in Reina's graduation single where she wasn't in all the B-sides.

(uf... bring back b-sides. >.>)