The popular animated work that can be enjoyed by children and adults is back in Shinso version! Manmaru, a penguin, was brought to the "mountain" by his grandfather from the zoo, and it was a world where various animals could speak human language and walk on two legs just like Manmaru. Manmaru, who became a student of Nenga-ryu, will train under Nenga, the leader of Nenga-ryu, with senior ninja Tanutarou and Tsunejiro. He played a role in resolving the incident with the hostile Iga and Koga ninjas, learned Nenga ninja art "Genshinjutsu", and gradually began to play an active role like the main character. * The electronic version reproduces the color manuscript that could not be published in the book version.