If you want to enjoy this audio offline on high-end audio equipment or use it in your own creative editing projects, converting the videos into the WAV format is your best option. Unlike MP3, WAV is an uncompressed audio format that preserves every detail of the original sound.
Visit a trusted online video downloader that supports Niconico and paste the link. Download the file as an MP4 video to your local drive. niconico to wav
| 入力（動画形式） | 出力（音声形式） | |----------------|----------------| | FLV | MP3 / M4A / WAV | | MP4 | M4A | | SWF | MP3 | If you want to enjoy this audio offline