Fans who attended the "S.C. NANANET Fan Club Event VII" that was held at the Saitama Super Arena on November 18 - 19, 2017, got two Mizukis for the price of one, because the "Aniki of Anisong", Ichiro Mizuki, showed up as a surprise guest to perform a duet of the Mazinger Z theme song with Nana Mizuki.
Translation: The other day at the Nana Mizuki Fan Club event, together with the 17,000 Mazinger Z fans, we had a double-MIZUKI collaboration Z! Thank you Z! #nanamizukifanclubevent #saitamasuperarena #17000people #allthefanstogetherZ! #deeplymoved #mazingerz #infinity #ichiromizuki
That is clearly more Mizuki than one stage can handle.
Paul Chapman is the host of The Greatest Movie EVER! Podcast and GME! Anime Fun Time.