Based on the hit video game series Kunio-Kun. Hiroshi is a student at Nekketsu High School, and is always bullied by everyone. One day, one man arrives at the school who changes everything. His name is Kunio!! Fighting the bullies! He looks tough, but he is a kind-hearted man. Kunio and Hiroshi become close friends. Thus begins the adventures of Nekketsu High and the man named Kunio.