Tensui Asana is 16 years old and attends Yotsuru Girls' Academy. She has been bullied by her family because of a birthmark on her wrist. While the girls are excitedly talking about the handsome new Japanese teacher, Shigure Saya, Asana keeps her distance. One day, an unexpected marriage proposal comes to Asana. It's a favorable offer for the Tensui family, who run a drug wholesaler...