Natsu, who came to Tokyo with her boyfriend 'Kazuma' on a kitchen car, was spending happy days. To run a bento shop, she managed to borrow the kitchen of a restaurant before business hours through an acquaintance's introduction. One day, Natsu's bento was ridiculed by Kata-yama, the wealthy and tyrannical restaurant owner, causing Kazuma to grab him. With Kata-yama enraged, Natsu had no choice but to apologize to calm things down. To protect her boyfriend's dream, she had to accept being summoned by Kata-yama even if it meant her shop might close. Natsu's body was gradually stained by the techniques of the powerful old man...
