The story revolves around people who possess the ability to infiltrate human minds and manipulate memories. Their powers have been used in the underworld for covering up accidents, assassinations, and all manner of crimes. However, these powers not only destroy others' spirits but also corrupt the users' own hearts. They chained to one another, protecting their fragile and insecure hearts. Out of fear and contempt, others called them "pets".

The story revolves around people who possess the ability to infiltrate human minds and manipulate memories. Their powers have been used in the underworld for covering up accidents, assassinations, and all manner of crimes. However, these powers not only destroy others' spirits but also corrupt the users' own hearts. They chained to one another, protecting their fragile and insecure hearts. Out of fear and contempt, others called them "pets".