AI Ren is a pure hearted high school student. His biggest wish is to have a better job after graduation from University, to be able to buy a house to live in and to marry his childhood girlfriend as his wife. But fate played a big joke on him. He met a tough opponent, and even his girlfriend was almost robbed. Under this strong stimulation, his outlook on life had a great change, from a pure young man to a strong man in the city.