Shimajirou: Shimajirou to Yuuki no Uta

Synopsis (en anglais)

The story centers on Miley, a young white tiger who is offered the lead role of Captain Hat by an acting troupe. Miley has no confidence in herself, so Shimajirou comes up with a plan to encourage her. Suddenly, they are sucked into a magical bag, and must embark on an adventure in the world within the bag. (Source: Anime News Network)