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As a high school student raised by his grandfather, a descendant of ninjas with the ability to communicate with animals, Ikujiro Mikawa encounters a wounded black cat named Rakan in the forest one day. What appears to be an ordinary black cat, Rakan, is actually the legendary monster known as the Black Star of Doom! Monsters seeking to exploit Rakan's immense power are secretly closing in, while the national secret organization, the Kogi Inmei Bureau, responsible for monitoring and eliminating monsters, also becomes involved. In the whirlwind of intense competition over Rakan's power among various forces, what will be the awakening of Ikujiro and Rakan? The ninja battle initiated by the meeting of the monster and the boy is now officially underway!!!