There's a secret competition called "dark rhythmic gymnastics". The entrees complete their beauty and lewd by their technique more difficult than rhythmic gymnastics. 
Haneoka Fubuki is a little brother-in-low of Haneoka Miku who's been missing. While he is looking for his sister, he finds her at the house of Tomomi, Miku's classmate. Acceding to Tomomi, she is trapped in the dark side of "dark rhythmic gymnastics". In order to help her out, he resolves his mind to become a coach of "dark rhythmic gymnastics", and he gets close to Fujimiya Koyuki who was chosen by Tomomi not knowing his fate... 
(Source: AnimeNfo)

A P.E. teacher, Nikusuke, happened to obtain a brief of "Dark Rhythmic Gymnastics Project". It is a competition where the players compete with others their lewdness. Following the project, Nikusuke looked for the players with Tomomi, a granddaughter of the board chairman. Their first game was Miku. Tomomi deceived innocent Miku, and she invited Miku out at night.

There's a secret competition called "dark rhythmic gymnastics". The entrees complete their beauty and lewd by their technique more difficult than rhythmic gymnastics. 
Haneoka Fubuki is a little brother-in-low of Haneoka Miku who's been missing. While he is looking for his sister, he finds her at the house of Tomomi, Miku's classmate. Acceding to Tomomi, she is trapped in the dark side of "dark rhythmic gymnastics". In order to help her out, he resolves his mind to become a coach of "dark rhythmic gymnastics", and he gets close to Fujimiya Koyuki who was chosen by Tomomi not knowing his fate...
 
(Source: AnimeNfo)

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