■How to unsubscribe from Niconico channels (computer)
Log in with your account, and you can see a list of all your currently active subscriptions from the following link. https://ch.nicovideo.jp/my/following *If you can’t see the channel on the list, the subscription is most likely on your other accounts, so make sure to check them as well.
Go to the channel's website you want to unsubscribe from.
Click on 退会手続きへ on the bottom right of the page to unsubscribe from the channel.
■How to unsubscribe from an Niconico channels (smartphone)
Log in with your account and go to the channel's website you want to unsubscribe from on your smartphone. https://sp.ch.nicovideo.jp/my/following *If you can’t see the channel on the list, the subscription is most likely on your other accounts, so make sure to check them as well.
Tap on the channel you want to unsubscribe.
Tap on 退会手続きへ on the bottom right of the page.
Follow the instructions that appear on your screen to unsubscribe from the channel.
If you can’t unsubscribe from a channel on Niconico（PayPal）
When you don’t have access to your Niconico account or can’t see the channel on your subscription page, you can unsubscribe from the channel by canceling your recurring payment on PayPal. If You cancel your PayPal recurring payment, your channel subscription will be canceled simultaneously. Please refer to PayPal support for details.