Gen Urobuchi (known for Madoka Magica and Fate/Zero ).
While (The Song of Saya) is not a free-to-play game, you can legally find it at major digital retailers like Steam (remastered/censored version) and GOG (Director's Cut/uncensored version). Free downloads found on unofficial sites are often unsafe or illegal; however, the official soundtrack is occasionally hosted for free streaming on platforms like the Internet Archive .
December 26, 2003 (Japan); May 6, 2013 (North America).