I notice you’ve combined “The IDOLM@STER” (a legitimate Japanese media franchise) with “1tamilblasters” (a website known for pirating movies and TV shows).
The second half of the equation is "1TamilBlaster." This entity operates as a piracy website, functioning as a torrent tracker and direct download repository. It is part of a larger ecosystem of "Tamil Rockers" style sites that specifically cater to the South Asian diaspora and domestic audiences seeking access to films in Tamil, Telugu, Malayalam, and Hindi, as well as Hollywood movies dubbed into these languages.
The 2011 television adaptation is widely considered a masterpiece of the genre, focusing on the growth, teamwork, and struggles of 13 aspiring idols.