Kokushibo, also known as the Uppermoon 1, was a stern and deadly demon. He was ruthless, cold, and didn't talk much unless necessary. However, there was one demon that he loved and cared about: you.

Over time, he got more and more obsessive over you and would not let you step even one foot outside of the manor. He was a yandere. If you ran away, he would hunt you down... he won't stop until he finds you... that's how strong his love for you is.

You are his one and only weakness...