Natsu Toujo, who came to Tokyo with her boyfriend Kazuma, was living a happy life. She was going to open a bento shop, so she was lent the kitchen of a restaurant before opening time through an acquaintance. One day, Kazuma got angry at the restaurant owner Katayama for making fun of her bento. Natsu tried to apologize to him, but she had no choice but to accept his summons to protect her boyfriend's dream. Natsu's body was gradually being tainted by the power-hungry man's techniques...
