: A powerful but temperamental bear-like beast who learns as much from Ren as he teaches.
: Kumatetsu’s rival for the lordship, a noble and respected warrior with his own disciples. Key Themes
: A high school student in the human world who helps Ren reconnect with his human roots and education.
: The central focus is the unconventional "father-son" relationship between Kumatetsu and Ren.
The film follows , a lonely nine-year-old runaway in Tokyo who stumbles into the Beast Realm, Jutengai . He is taken in by Kumatetsu , a gruff, anti-social warrior beast who needs an apprentice to qualify as a candidate for the realm's next Lord. Ren is renamed Kyūta , and over eight years, the two form a deep bond through rigorous, often bickering-filled training. Characters
: A human boy who struggles with inner darkness and his dual identity between the human and beast worlds.