Yaiba Kurogane  

Raijin, Ryuujin, 鉄刃

One day, while Yaiba was eating in the forest with his father Kenjurou, they were suddenly attacked by gorillas. Despite trying to escape, they ended up hiding inside a box filled with pineapples that was being transported into the city. Once they arrived at their destination, Yaiba discovered that he was actually a legendary warrior and had to battle against Takeshi Onimaru, a high school student who appeared demonic in nature.