Lu over the Wall

is a 2017 Japanese animated fantasy film produced by Science Saru and released by Toho about the eponymous ningyo. It was directed by Masaaki Yuasa, and written by Yuasa and Reiko Yoshida. The music was composed by Takatsugu Muramatsu. It is the second Science Saru film, though it was the first to be produced. The film was released in Japan on May 19, 2017, It was also released by Anime Limited on December 6, 2017, and by GKIDS on May 11, 2018. Half Symbolic Films released the film on January 31, 2019. Plot is a lonely and pessimistic 9th grader living in with his grandfather, an umbrella maker, and father. His rock band, "SEIRÈN", was formed by his friends, and . One day, Kai explores and meets , the ningyo girl. The music beat allows her fish fin to transform into a pair of human legs. The two strike up a friendship, and Kai takes Lu around the town for a tour. Kai learns that Lu cannot touch sunlight or she will burst into flames. He also learned that Lu has a papa and her mother was killed by a ship. Kai introduces Lu to Yuho and Kuino. When Kai accidentally reveals the secret of the merfolk to the townspeople, Lu's love and power of music makes them dance around town. Despite Kai's selfishness, videos of Lu go viral and she becomes a celebrity. Inspired by her popularity, Yūho's grandfather reopens an old merfolk-themed amusement park on an island near the town. Kai becomes disinterested in the band and begins to ignore Lu. SEIRÈN plays the park's opening, but after Lu arrives and steals the show, Yūho becomes upset and runs away.