The new TV special will be about the battles against Jigen, who aims for Lupin who searches for the treasure. Goemon, who is angry because he cannot forgive betrayal of Jigen, will fight along with Lupin against the strongest enemy in the history.

(Source: MAL News)

The episode focuses on Lupin's gang descending upon the Kingdom of Dorrente in order to rescue a famous thief who has been detained. While this takes place, the most notorious thieves from around the world gather in the kingdom.

(Source: MAL News)

Goemon's wedding to Murasaki Inabe, daughter of a samurai clan's leader, is interrupted when the Fuma ninjas attack, kidnapping the bride-to-be and demanding her family's ancient treasure as ransom. Lupin, Jigen, Goemon and Fujiko work together once again to try to save Murasaki and get to the treasure before the Fuma can steal it. (Source: ANN)

Kai, a young middle schooler, lives in Hinashi Town, a lonely fishing village, with his father and his grandfather, a sun-umbrella maker. He used to live in Tokyo, but after his parents divorced he moved back to his parent's home town. Kai has trouble telling his parents the complicated feelings he has for them, and he's lonely and pessimistic about his school life. One of his joys is uploading songs he writes to the internet.

One day, his classmates Kunio and Yuuho invite him to join their band, "SEIRÈN." As he reluctantly follows them to Merfolk Island, their practice spot, they meet Lu, the mermaid girl. Lu sings merrily and dances innocently. As Kai begins to spend time with her, he starts to be able to say what it is that he's really thinking.

But since ancient times, the people of Hinashi Town have thought that mermaids brought disaster. Something happens that puts a huge rift between Lu and the townspeople. And then, the town is in danger. Will Kai's cry for the heart be able to save the town?

(Source: Fuji Creative Corporation)