I think when ayu cries most of the time it's for real...
usually it's at the end of her concert tour... and when you think about it, they have been working hard all year for this concert and now it's over... can be emotional for everyone... other times she cries I thinks it's because of the message of the song... like when she did TeddyBear/MemorialAddress back to back and kinda got a little teary (I believe this song was for her dad) so I think that her crying is real