When Shimizu Mokomi was a child, she created her own imaginary world. She would have conversations with stuffed toys, stones, and plants. She also could sense the emotions of inanimate objects. Due to this, she was considered as a weird kid and scolded by people. Mokomi stopped going to school when was she in the 5th grade of elementary school. She eventually graduated from high school by taking correspondence courses. She continued to spend most of her time talking with things in her room and indulging in her fantasy world. She didn't always stay inside though. Her older sibling sometimes took her out.