The One-Inch Boy, sometimes translated as "The Inch-High Samurai", originates from a Japanese folktale. Born from to an elderly couple, they gave him his name after seeing how small he was. After realizing he would never grow, yet he would go on a journey and become a samurai, Issun-bōshi is given a sewing needle for a sword, a soup bowl for a boat, and chopsticks for oars for his journey.
He receives a job from the government and accompanies a princess. As they travel together they are attacked by an Oni, which Issun would defeat by attacking him from the inside after the Oni swallows him. This causes the Oni to flee and drop the Uchide mallet, which the princess uses to make Issun human size.