Usao is a Japanese hare character featured in the film adaptation of the anime project based on the educational book series. Within the film, Usao appears as one of the navigators in the segment "Hachiawase no Mori" (Forest of Encounters), set in Azumino, Japan. This segment is part of the film's exploration of various geographical regions known for their rich natural environments and the creatures living there. Usao has a mother, a familial relationship present within the narrative. The character also appears in merchandise related to the film project.