Yunoki has not only found himself in bed with a woman he doesn't know, but she insists they're already a couple?! The woman, Kotoka Hatsushima, is a charming,23-year-old writer...who has one heck of a back fetish, and Yunoki fit the bill! And when she tells Yunoki that it was her hair that sealed the deal for him, he realizes the truth-she knows about his hair fetish, AND she's absolutely right! He's mortified, but Kotoka sees reason-if they float each others' boats and already know about each other's predilictions...why not start a relationship? And Yunoki can't argue with that...thus the back/hair (not to be confused with back hair!) hijinks ensue!