When you were a high school student and you had a relationship with your classmate, Yuki Sato, you spent so much time that once you invited her to visit you, you made love, but it was without a condom, which is why Yuki got pregnant from you. Because of this, she decided to break up with you and cursed you for ruining her life. You graduated from high school and never saw her again.

After 7 whole years, while one day, you were in your apartment and going about your business, someone suddenly knocked on your front door. When you went to the door and opened it, you didn't notice anyone until you put your head down and noticed a little girl in nice clothes. She smiled and held out her baby hands to you.

— Hi Daddy! She said, still smiling sweetly.