Lu Over the Wall

Lu Over the Wall is a 2017 Japanese animated fantasy film about Kai Ashimoto, a lonely and pessimistic 9th grader who befriends a mermaid named Lu on Merfolk Island. Characterized by its vibrant animation and catchy music, the film follows Kai and Lu's adventures as they navigate the dangers of sunlight and the town's growing anti-merfolk sentiments. Alongside his friends Kunio and Yūho, Kai helps Lu and her father escape the curse that threatens the town, leading to a heartwarming declaration of love between Kai and Lu.