Daijuro Santo is just your average nice guy, gets good grades, and always does the right thing. Then he met Ami Mizuno. They both hit it off when they first met but Ami always ended up in certain situations that she just was not expecting to be in. So Daijuro stuck around to protect her. Even though she became interested in Seto Kaiba which was obvious to him, he still stuck by to protect her in case she may have needed him. Despite his own interest in Ami, he backed off and stayed her friend whenever she needed someone to talk to.