An Immortals Kingdom
Matsumoto is an immortal Oni. He was sent by the mother of all Oni to protect the forest she gave to the samurai. During his first war, after waiting for hundreds of years. He decides to take over. He wants to become Feudal Lord. He meets a strange man named Ishikuro who is a time traveler dying from Cherenkov radiation poisoning. Ishikuro and Matsumoto quickly become frenimies. Most say they are like brothers. However, after having a falling out they act more like enemies. With Ishikuro always getting in the way.