Maria's little sister, she is too young to attend the academy but is a part of the cosplay club nonetheless. She is the object of Jenny's desires, though Maria often has a fainting spell whenever the two interact.-By Wesker_CDA

Meet Chako and her friends from the Cosplay Association at East Oizuki Academy! They're the hottest new cosplay team in Japan...fresh from a winning streak of local battles, they're set to sweep the Cosplay World Series! 
Yeah, right. 
In reality, Chako and her friends are barely able to keep their club alive at all. Feeble club membership and a lack of sponsorship might be the end of their cosplay dreams before they can even start. But don't you dare underestimate this group of spunky girls! They'll survive a barrage of pervy newcomers, cosplay rivalries, costume disasters and dating mishaps in order to reach their ultimate goal of competing in the World Series. The clothing flies as the girls suit up (and strip down) for Cosplay Complex! 
(Source: DVD Back Cover)

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Ai Shimizu is a Japanese voice actress and professional wrestler. She has a career as a singer, signed to Lantis. She has released 14 singles (including joint and character singles) and four albums. She covered Yumi Matsutoya's "Toki o Kakeru Shōjo" as the B-side of her first single "Angel Fish" in 2003. She is known to have a close relationship with Mai Nakahara, having collaborated in eight anime where most of the characters they voiced in together had close connections: DearS, Kage Kara Mamoru!, My-HiME, My-Otome, My-Otome Zwei, Please Twins!, Sola, Strawberry Panic! and the Lucky Star drama CD. Shimizu has worked sporadic professional wrestling matches since December 2013

Athena Imai