Utena's desire to own a new dog had been growing stronger each day. However, she wasn't referring to an actual animal, but rather a human slave dog—a male masochist. Intrigued by a thread she found on an internet forum, her curiosity deepened until she finally decided to invite him into her room. There, she encountered a man who treated her with polite attentiveness and care. Utena began treating him as her personal sex slave, gradually building a deeper, more intimate relationship. The joy and pleasure she discovers throughout this process, along with the evolving dynamic between them, form the core appeal of this story.