Nico☆Sound (-β——A service to convert Nico Nico Douga videos to mp3

I introduced a while ago a local NicoNico Douga download management tool. To be honest, I personally feel that its functions are already quite comprehensive. However, I still decided to introduce another service related to NicoNico, which is this "Niko☆Sound (-β)." This is a service that converts videos from NicoNico into mp3 format online and provides downloads. Although I'm not sure why people would want to convert NicoNico videos into mp3 format instead of other video formats, it seems that many people have done so, as there are already a lot of converted mp3 files available on this website.