|First Appearance:||Episode 139: Yume, Tell Us a Story!|
Yume (夢, Yume-chan) is the technical owner of Maxwell. He is owned by her older brother, but she's the one that actually looks after him. She is also the youngest child of the book store owners.
In the episode A Little Love Story!, She writes a book about a Hamster called Nana and her love for a hamster named Yu. This interestingly takes the same form of relationship Maxwell (her hamster) had with Sandy.
In The Ham-Ham Explorers and the Romance Story!, she makes a second book, this time of Hamsters on an adventure in a cave. Once again the plot mimics that of the Ham-Hams adventures.
- If she was dubbed into English, she would have been named Melissa (hence the title of Episode 139 would have been "Melissa, Tell Us a Story")
- She attends the same school as Laura and Kana but is a year younger.
- Yume (夢) translates to 'Dream' because of the fact that she writes stories that the Ham-Hams tend to go on themselves.