This is a variety program where Nishikawa invites over guest musicians to his "home" (studio set) and talks with them about music in a candid and social manner. For his 63rd episode, he invited over 3 members of Hello! Project's idol group Berryz Kobo -- Chinami Tokunaga, Saki Shimizu, and Yurina Kumai, and his statement in question came at the beginning of the segment.
During the self introduction of the guests, when Kumai, the "nearly 180cm tall idol", greeted the viewers, Nishikawa praised her appearance and said, "Wow, you've really become mature these days". But for some reason, he said, "But it looks like you've got rough skin. Could it be that it's your menstrual period? The skin around the mouth tends to get dirty easily when you're bleeding", to which Kumai reacted by suddenly covering her mouth.
(Continued after the jump, video inside)
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