Two tiny, aquatic humanoids search for their missing father, a boy battles a lethal allergy to eggs, and an invisible salaryman tries to become a hero.

Although her mother died when she was ten, Noriko still receives yearly birthday cards from her. Her life gets complicated as she grows older but she still finds comfort in her mother's messages.

Aiko Satō, who has won many literary awards, retired from her life as a writer and had no guests. She spent a gloomy time, but then a middle-aged editor named Tachibana came with a commission for a story. The story begins with a series of essays that are initially unpleasant, writing out her anger towards society. Aiko's life will undergo significant changes by the time she is 90 years old.

Onuki asks people in a hospital to perform a play for Paco, who suffers from memory disorder. His only hope is to help Paco survive from her illness.