- Type: Activity / Attribute / Contextual
- Description: Psychotic behaviour motivated by obsessive love. This includes stalking or abducting the person of interest or intimidating or hurting perceived rivals. If there are any sexual activities the crazed individual must be directly involved in them at some point.
- Gender: The gender of the one behaving psychotically determines whether the tag is placed in the male or female namespace.
- Japanese: ヤンデレ
- Slave Tags: Female, Male