Manga Sword Sheath's Child

Bira is an ordinary child who loves fishing, his life and traveling in the desert with his grandfather. One day, his grandfather left him in the northern part of the forest, telling him to wait, after which he disappears. Bira waited for many years, managed to acquire a home and make friends with a family of bears. At the same time, he strictly fulfills his grandfather's order to stay away from people. However, quite by accident, he met the life of a guy who becomes his friend. After a while, Bira learns that his friend is in danger, so he goes to his rescue.