Jun's in WPB again, turns out I'd already ordered this for the Mayu photoshoot/cover:
Basically, it's from her old WPB shoot, they are doing a competition between 8 people, and the winner gets a 7-page spread! I think you have to fill in a questionnaire you get with the mag. Whilst this shoot is a bit, well... I'm not sure how well she'll do but I hope she does well as a 7-page spread is a big opportunity for her.
They uploaded a video, also:
Edit: looking at her page in WPB again, it says "H Cup no Mayuyu!?" in the top right, I can't read what it says before that, but why Mayuyu??? What does it say?
Edit2: Someone told me it says "The girl that suits school-swimwear best in Japan, this school-swimwear angel is an H-cup Mayuyu?!". Wow, gotta love the Jun-Mayuyu comparison!