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Hirajima Natsumi, Okada Mei, Hazuki Himari, and Negishi Ai arrive at a luxurious beach house. Soon after arriving, they are informed that they will be competing in a series of challenges, the overall winner of which will be deemed the "center" of Merm4id. These challenges are interspersed with gravure-type segments that feature all four unit members. Challenges include guessing what sports each member played in school, cooking omurice, drawing logos from memory, guessing smoothie flavors, a capture-the-flag game involving inner tubes, and guessing items related to their D4DJ characters through touch.
DIRECTOR
CAST
![](https://image.tmdb.org/t/p/w92/u6cfTONGHmHsU003ei1nQ8zS0LH.jpg)
Natsumi Hirajima
Rika Seto / Herself
![](https://image.tmdb.org/t/p/w92/sAZnSC0fACxhOuPxAZrBPwvC8JV.jpg)
Mei Okada
Marika Mizushima / Herself
![](https://image.tmdb.org/t/p/w92/bm5RWhJl7q2c4z8UdXIrEr5ZUbD.jpg)
Himari Hazuki
Saori Hidaka / Herself
![](https://image.tmdb.org/t/p/w92/kPP2hqLRZ0MTrD2gsSR29rdOgbj.jpg)
Ai Negishi
Dalia Matsuyama / Herself
![](https://image.tmdb.org/t/p/w300/67sAbZCHqr3oW5QUeyAX8k6spSO.jpg)
![](https://image.tmdb.org/t/p/w300/8PDSKL3ArKHrisoZr073d66gFsM.jpg)
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