The best song I've ever listened to, it is so elegant and beautiful my words would fail to describe its beauty. I simply adore this song! Thanks for uploading it.
This is from 東方四重奏3, not 東方四重奏2. Also this sounds more like Dream Battle from IN instead of the original from LLS, though it seems the arrangers intended it to sound like the original judging from the title. Either they failed to do that or they may have been planning to do LLS at first but ended up doing IN and forgot to change the title... :\