第 1 季 Jiro Azuma is no average high schooler. A descendant of ninjas and trained in the ancient warrior art of the shinobi, Jiro is also able to talk with animals. After a mysterious encounter with an injured cat named Rago, Jiro discovers the feline is actually the legendary Black Star of Doom! Joined by the Bureau of Espionage, they fight off swarms of mononoke lying in wait to exploit Rago's powers.

牧羊人離奇身亡，死因撲朔迷離。他的羊群決定挺身而出，為了查明真相，毅然踏出熟悉的牧場，闖入人類世界。