Xiaolan, a middle school student, received a mysterious gift on her birthday. It was said that she could make a wish. With fun in mind, she made a wish: to go to the world of Conan. As a result, he really traveled through time and became Mao Lilan! However, one day, a mysterious old man suddenly appeared and told Xiaolan that because of Xiaolan's wish, the real Mao Lilan died. So in her guilty heart, she decided to atone for her sins, help Conan solve the case, and silently guard Conan (Shinichi)...