Looking for logging into the Niconico site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Niconico site. After that you can login as usual with your login credentials.
https://account.nicovideo.jp/login
http://blog.nicovideo.jp/en_info/2015/01/post-051136.html
https://en.wikipedia.org/wiki/Niconico
https://niconicorentacar.jp/login/
http://cosmicbreak2.cyberstep.jp/_niconico/
http://bugmenot.com/view/niconico.jp
https://www.npmjs.com/package/niconico
http://www.mmcafe.com/nico.html
http://en.niconico.sarashi.com/
https://www.oculus.com/experiences/go/1050036025028695/
https://www.roblox.com/groups/22014/Nico-Nico-Douga
https://www.wikihow.com/Register-for-NicoVideo
https://www.techinasia.com/nico-nico-douga-english