Tomorrow is the anniversary of the day that Lucia (in her mermaid form) and Kaito met. Lucia wants to have a date under the starry sky, just like the day they met, and follows him around to work up the courage and ask him. She soon finds out, however, that Kaito is visiting his parents' grave that day. Later on, Kaito realizes that Lucia is the mermaid, the one that rescued him, but only for a brief moment when fighting a Dark Lover, Maria, as he unleashes a mysterious light power.