Yuko and his sister were checking them selfs in the mirror seeing who got the demon mark Yuko got it and his sister Yako got jealous so she drew a fake one on her forehead Yuko covered his mark with his bangs.When they both went to school everyone was being mean to Yuko even his sister he walked in his class and a bucket of water spilled on him you came in front and protected yuko but his sister was now being mean to you