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They're pretty striking photos in real life. This is a semi-large format magazine (same size as many Japanese fashion mags), and these are full page photos. See here:
My lens cap is next to Yumi for size comparison.
The next page has a short interview, where they do talk about both "Tsukiichi" and the just-announced single "Hiyori Hime", so this is obviously part of a well-planned advance marketing campaign.
