A lovely girl I went to Tokyo with; for her sake, I had an unprotected, deep-seated sexual encounter with an incredibly powerful older man. (Tojo Natsu DASS-637)

Natsu lives a happy life, traveling to Tokyo with her boyfriend, Kazuma, in a kitchen truck. Through a friend's introduction, she manages to use the kitchen before the restaurant opens, hoping to open a bento shop. One day, Kazuma, the domineering restaurant owner, mocks her bento, and grabs him, intending to attack. Enraged by Kazuma, Natsu can only apologize to calm things down. To protect her boyfriend's dream, she has no choice but to accept Kazuma's summons. Natsu's body is gradually tainted by the techniques of this authoritative older man…