On a day without any warning, a mysterious person wearing a school uniform and a sunflower mask stormed into Demingkan High School. They cruelly tortured the pregnant teacher, Yasuda (played by Shinichi Sasaki), ordering all teachers to hand over their phones and demanding that the school complete the puzzle within three hours, otherwise they would kill Yasuda
On a day without any warning, a mysterious person wearing a school uniform and a sunflower mask stormed into Demingkan High School. They cruelly tortured the pregnant teacher, Yasuda (played by Shinichi Sasaki), ordering all teachers to hand over their phones and demanding that the school complete the puzzle within three hours, otherwise they would kill Yasuda