Yuki is a young girl living at a facility away from her parents. Mary is a dog abandoned by her owner. The story’s backdrop is that of an orphanage, where children unblessed by the love of their parents live side by side. One day, the children come across a stray dog. Their wish to keep and raise the dog together at the orphanage comes true. After being captured and almost put to sleep, the dog was saved. Her name would be Mary, and she would try everything in her power to repay the children.