Xiao Ai. . This name is full of sadness. . . Beside her, there is a self-righteous and righteous detective, Kudo Shinichi, and he was once made smaller by the medicine made by Ai. Xiao Ai, who has always been guilty of this, has been making antidotes for him. Perhaps, it is not just guilt. . . This love. . Love is always only hidden in the heart, because he also has a childhood sweetheart girlfriend, Xiaolan. She doesn't want to hurt them, the person she loves and Lan who is very much like her deceased sister. . . And what happened when Kudo Ken faced his true feelings? . .