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Aruru is the youngest of the main characters and Eruru's younger sister.
She is shy and quiet but gets into a lot of trouble because she is always active. Her sister is her only living relative and so seems to have a relationship much like a child and mother. At first, she wouldn't go near Hakuro but she came to like him and now calls him papa in a loving manner. It is thought that because she only knew her father for a short time, she is mistaking him now as her father that has come back.
Somehow she made a promise to the god of the forrest that when the god was killed, Aruru would act as mother for her cub.