Ren the Ninja: Wolf Tracks (vol. 4)

Ren is a true ninja who can speak with animals. Ren lives a completely normal life in the present. But when a wolf kills a sheep nearby, the peaceful atmosphere is shaken. Then a mysterious master, Miya, appears, and pressures Ren to travel back in time in order understand the wolves as a ninja. Ren is to help the wolves learn to avoid humans and their animals.

Together with his faithful dog, Ren embarks on a thrilling adventure that involves courage, friendship, and the protection of nature.