This is what I've noticed from various J-Pop sites I've visited...
Concerning the five main J-Pop divas:
If you stan for Namie your second fave is most likely BoA.
If you stan for BoA your second fave is most likely Namie.
If you stan for Kumi your second fave is most likely Ayu.
If you stan for Ayu your second fave is most likely Kumi.
If you stan for Hikki your second fave is most likely Namie.
Am I wrong?
