しろ

"Taro... what do you think of... this mansion?"

A mysterious girl who lives in the mansion with the sisters. Though she keeps a poker face on almost all the time, she starts showing her friendly side more after Taro comes to live into the mansion, and begins to bond with him due to having to do the same work as him. Due to Shiro having a weak presence, almost nobody outside the mansion remembers her, nor does know about her.