Karin Yoshii habitually eats very little regular food, relying instead on snacks and chocolate as her main diet, resulting in an extremely unbalanced nutritional intake. Consequently, her nails have become brittle and thin, her overall health is poor, and she frequently suffers from unstable physical conditions and anemia. Due to this, she may lose consciousness quickly when her neck is constricted, a reaction easily mistaken for a simple fainting spell caused by anemia. On set, these risks required careful and cautious handling. Since a fatal accident would render the production meaningless, safety was given the highest priority throughout filming.