Based on the original manga, Ichi-1 is the prequel to Takashi Miike's Ichi the Killer. Nao Omori stars as Shiro Ishi (the future Ichi) and Teah is Dai, the best fighter at the local high school. Whenever Dai gets into a fight, Ichi is voyeuristically watching nearby, enjoying the brutality. Dai confronts him but Ichi cannot tear himself away from the bloodshed. Everywhere Ichi goes he is considered a weakling and is bullied, taunted and made fun of. Even the younger kids from his karate class show him no respect, but Ichi refuses to fight back. However, on a fateful summer's day, Ichi is pushed too far by a group of his fellow students.