Ishida's older sister. She is significantly older than him as she already graduated from college when he was still in elementary school. Curiously, she is the only character with lines whose face is never seen. According to Shouya, his sister had dated numerous men, one of whom has a younger brother who was bullied by Shouya. Later, she dated a Brazilian man named Pedro; this time, her relationship stuck, and she had a daughter, Maria, with him.