Yukino

Yukino is the third girl to whom Takashi allowed to live with him. She is a goldfish who was turned into a girl, but her long, pointed ears make her look more like a fairy. Takashi found her sitting at his door wearing only a school swimsuit. She was named after Takashi's goldfish he was keeping a while ago, whom he also called Yukino. Since that day, she is living with him in a body of a girl.
She is the youngest among the four heroines, she has an innocent personality and appearance, she has the role of a mascot of Takashi's household. It should be noted that she cannot speak a single word except for "Au" because there were no parts in her goldfish body that fitted to be transformed into vocal cords.