Everything started when a high school couple, Chiyomi Horikiri and Susumu Minami had a mysterious and ominous fortune cookie at a Chinese restaurant:“If you stay close to him, he will become great and the two of you will be together for a long time. However, when the two of you drift apart, horrible things will happen“. Just as the prophesy, on the very day when Susumu decided to leave Chiyomi, a magical curse struck Chiyomi. Believe it or not, it shrunk her into a size of merely 16 cm tall. What would happen when a tender boyfriend and a miniaturized girlfriend secretly starts living together?