From the author of Gokusen and Koudaike no Hitobito comes the story of Yui Hayakawa: an ordinary, uninspired high school girl who's only good at one thing - running! But because of her genius younger brother Takeru and his latest experiment, a time machine, she accidentally gets sent back to the Sengoku Era missing her beloved dinner steak! Will young Yui finally find that 'something' where her entire potential was hiding? And will she ever be able to eat that delicious steak her mother made for her?