Roko, orphaned by vampire violence, encounters Shadar during the conflict with his vampire family. After Shadar eliminates the vampires, he adopts Roko as his new companion, replacing his previous talking dog. This adoption signifies a tonal shift toward darker narratives in the series. Roko joins Shadar's quest to rescue Shadar's mother from the demon king Spectro (Ghostar), fighting alongside him against supernatural foes. Roko's background as a vampire orphan directly motivates his adoption by Shadar, establishing their new partnership dynamic that defines the series' second phase.