Koji Minamoto was the child chosen to wield the Spirit of Light. Koji starts the series as the group loner - a kid who wanted friends, but never had the chance to make any because he had to change schools too many times. Koji receives Ophanimon's cell phone message while he was out buying flowers for his stepmother. He followed the instructions on the SMS, which led to a subway station where a Trailmon took him to the Digital World.
Source from Wikipeida