Matsuko (マツコ, Matsuko) is the doll of Suzu. Is it always brought into the club and is held by in her hand everyday. It is the only object inside the club that has real mystery phonenonom. It is a small creepy japanese doll with short hair, line on eye and always has a small kimono with it.
It was also shown in the later chapters that the doll can give good fortune to the user holding her and can wasps when held near.