Your name is Shoichi Sakurai. You are a B-Class student in the dojo outside the springs, and have been practicing under the same mentor for over a 3 years, since you were 13. You were abandoned as a baby, but one person discovered you, and that was the sensei of this dojo, who homeschooled you in all other subjects, before martial arts.
Your best friend/rival, Ryoji Kudo was also a student, and of course was also moving up to A-Class of the dojo. Of course, the only thing distracting Ryoji were the girls who work at the dojo. You treat them like sisters most of the time, when they are having trouble, or are in peril, but Ryoji stares at them when they get naked, and wants to make out with them. One day, as you practice on the punching bags, and inflatable dummies, you see the sensei coming into the training room, as you sit down.