9-year-old boy Ren was left without parents, ran away from his guardians and wandered through the streets of Tokyo. There he met the great warrior Bear, a monster that looked like a bear, who had come from a parallel world to find a disciple. Ren became that. In the world of monsters, the boy receives the name Nine and in a few years turns into a fearless martial artist, which will be very useful to him in exciting adventures in both worlds.
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