Murasaki is a Manga/Manhwa/Manhua in (English/Raw) language, SPORTS series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Ichijou Murasaki is a girl with dreams of entering the world of interpretative dance - but she knows she hasn’t got the charisma, the fitness, or the commitment to do it. Watching on the sidelines, she eyes her classmate, the naturally brilliant Sumire Sora with envy… until a chance encounter with dancing prodigy (and absolute complete weirdo) Shounosuke makes her finally get the resolve needed to dance out her dreams! Fuelled by grudges, anger, and pure energy, Murasaki will dance!!