Must hear more! I am not sure if I can see myself listening to it repeatedly on my iPhone, but I may start bawling when they perform this during Sayu's graduation concert. I'm with everyone who says this should be the defacto graduation song sung by kohai members when a leader graduates. I think tears will come to my eyes whenever this song is performed for that kind of reason.
I just listened to it (I somehow missed the preview when I made may last post) -- it instantly became my favorite Morning Musume song since Sakura Mankai, at least!
If madness made us strong, we would all be invincible.