Haibi's Granny (ビスカスちゃんのおばあちゃん, Bisukasu-chan no obaachan) makes an appearance in the second OVA. Her grandchildren are Haibi and her two siblings. When her grandchildren were young, she used to tell them stories of her adventures, much to their delight.

She, Elder Ham, Auntie Viv, and two other hamsters created a secret treasure map when they were younger as part of a game, and they made up a special song so they would not forget the way.

She got heatstroke while gardening during a very hot summer, and in an effort to make her feel better, Haibi went off in search of her grandmother's secret treasure.

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