All because of "love"

Announced and revealed at Anime Central 2024's "Kinema Citrus Sweet 16: My Happy Marriage and What's New" panel, this anime follows a mermaid who makes a forbidden wish to be loved by a human. Following her death, she is reborn 200 years later into modern-day Japan in Lake Biwa, where she learns to adjust in a human world.

(Source: Anime News Network, edited)