Because I’m sure we’ve all been waiting to hear an uninterrupted version of Nana-san’s opera singing.
Chapter 4 on the sidebar (on the right) is the opera song. Chapter 2 and 3 are also songs sung by Nana-san (as the character Jenice Caitlain – so the opera feel is there as well).
For those of you who have problems loading up the official website, here’s the NicoNico version with all 3 songs together:
…Once again, Nana-san’s talents know no bounds. :3