If you can't reset your login/password to the e-mail address you recall that you registered with pixiv, it may be that in fact, you registered with a different e-mail address.
The password reset form will only send instructions to your registered e-mail address. Please try logging in to the e-mail address where you receive update notifications or notifications of support, or try resetting your password for this e-mail address.
■ Password reset form
https://accounts.pixiv.net/password/reset
If you made a pixiv account using an Apple ID
Please refer to the FAQ below.
I made an account using my Apple ID, but I can't reset my login/password
If you cannot receive e-mails at your registered e-mail address
If you cannot access your registered e-mail address or the e-mail account is no longer active, you will not be able to reset your password.In such cases, we will verify your account based on your transaction details and provide instructions on how to update your e-mail address.
Please refer to the FAQ below and select "E-mail address unavailable” as the reason for your inquiry.
I can't log in to the account I'm supporting a creator with