Mental picture required: The note will not take effect unless the writer of the note has the person's face in mind.

40-second rule: If the new form and/or personality are not written within 40 seconds, the person will Yuri at random (with whoever is compatible and closest).

6 minutes, 40 second rule: After writing the basic details of the Yuri, additional traits can be specified within the next six minutes, 40 seconds.