On the big screen at Tokyo Dome Day 2 "AKB48 2013 Manatsu no Dome Tour"
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And here is the same performance from Day 4 (today). Thanks
YKT for finding the pic!
Compare the two pictures carefully and you'd find that MaYuki have changed the hand that they use to hold their mics so that the mics are not in the way today
They probably realised their mistake on Day 2