"I look forward to working with you from today onwards," says his father as he brings home his new wife, the nurse Satsuki, whom he admires. The angel in a white coat was so kind to Kohei, who had no idea what to do during his first hospital stay, but now his father has taken her away. Of course, he is happy that she will become part of his family. He is sure she will make a good mother. However, what Kohei wants is not a parent-child relationship, but a romantic relationship. Knowing that he cannot reverse his remarriage, Kohei decides to cross the line with Satsuki, who has become a mother.