Lu Over the Wall is an anime film that premiered in spring 2017, produced by Science SARU.

About the production: the story comes from an original script, the film runs about 112 minutes and its current status is "finished".

Its main genres are adventure, fantasy, music and supernatural, with themes such as Mermaid, Mythology, Coming of Age and Dancing.

On AniList, Lu Over the Wall has an average score of 72%, a good score, and appears on 22,519 users' lists.

Kai Ashimoto, a gloomy young middle schooler, lives in Hinashi Town, a lonely fishing village, with his father and his grandfather, a parasol maker. He used to live in Tokyo, but after his parents divorced he moved back to his father'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, "SEIREN". As he reluctantly follows them to Merfolk Island, their practice spot, they meet Lu, the mermaid. 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. (Source: Wikipedia)

Official synopsis from AniList.