A resigned girl remembers something she’d forgotten after being forced to spend time with a rather odd transfer student.

(Source: MU)

During a summer trip to the beach with her mother, four year old Tokiko is saved by a mermaid after wandering into the ocean. Years later she returns to live in this town by the sea with her father, and is drawn to a boy in her sixth grade class that stirs this old memory.

As the end of high school looms near, Mayuko is unhappy with her performance in the last mock exams. Nudged by her friend Megu, she seeks help from Haru, another classmate. They become friends, and maybe, just maybe, something more.