Nana mentions that the PV was shot in a sewage reclamation plant
in Ibaraki the month before her appearance on the show, and despite it being indoors it was still cold if one were to get close to the water. Also, because the place was so huge, even if there were lots of people, they would still be cold. Then she adds that as they (she) were filming with great vigor, the thought occurred to her that "she really does get cold every time there's filming". xDDD
The theme for the PV is "white and black", and the story is set in a future where no life is born. The "white her" is quarantined off in a sterile room as the world would get contaminated with the presence of life. So then she decides that things can't go on like this and decides to make a break for it. The "black her" singing is an expression of the inner self of the "white her".
The PV carries the idea of her hope of changing the world with her song/singing, and because the outlook was that any life would result in contamination, even details like the petal turning black after wilting were shown as well.
Nana then goes on to add that all the PVs she's shot up till then have been fairly easy to understand, but this time round they were changing somewhat for something with a mysterious tone. (OS here: they really succeeded, seeing how the PV turned out so denpa there were even folks who nicknamed the plates curry plates and others that wondered if it was about SARS rofl)
So as to let the things thought about by watchers [after/during watching the PV] be uniquely different, such as the questions they might have, it was decided that she would send out the above message through the elaborating of the PV-making to let everyone think about it.
On the final scene with the guys in white surgical gowns (I think that's what those're called), Nana says that it gives her the shivers no matter the number of times she watches it and that it's even scary to watch at night. lol
"The makeup and outfit were both rather different compared with before" -mention of barrier jacket here! xD *someone tramples ikka*
On the suspicious-looking guys in masks at the back, they actually appeared in the PV called
Rush&Dash (OS: *shocked*
SRSLY!?) and "could probably be thought of as Cherry Boys Jr". They were also the ones playing instruments.
She ends off here saying that the guys were "kakkoi" and that she would be very happy if one could think about the PV's meaning while watching it.