If a password that can be easily guessed by a third party is set (e.g. same as pixiv ID), you will be prompted to change the password for security reasons. Please promptly change your password.
You can use 6 to 72 digits that include alphanumeric characters (a-zA-Z0-9) and symbols (=+*:;!|$&%#@~.,?_"&#'(){}[]<>^/\) for your password.
Do not use a password that can be easily guessed by others, such as English words that can be found in the dictionary or combinations of only pixiv ID and numbers.