Chapter 1. Siren Rhapsody (Ningyo Rhapsody, 人魚ラプソディ)
In a world where sirens are common, the protagonist is a hybrid of a human father and a mermaid mother. He's always playing the piano under the sea, when a strange siren approaches him…
Chapter 2. "When I Woke Up I had Become a Girl" Disease (Me wo Sametara Onnanoko ni Natteita Byou, 目が覚めたら女の子になっていた病)
A boy wakes up to discover he has become a girl! How will this affect his daily life?!
Chapter 3. Nayuta of the Prophecy (Yogen no Nayuta, 予言のナユタ)
A tale about a prophecy involving a girl with horns who is said to bring destruction upon the world, and her brother.
Chapter 4. Little Sister's Elder Sister (Imouto no Ane, 妹の姉)
A story about sisters aspiring to be artists.