Ruku Minatomachi is a 15 year old high school student from Yokohama. Her dream is to travel the world to eat delicious gourmet food. Upon being told by her parents that she's actually a highly efficient, time-traveling android, Ruku embarks on an adventure, traveling back to the Taishō Era (1926) to search for her grandfather. She meets Demon upon her arrival and is whisked away to his domain.