 Later, they are rumored to be a couple, to the annoyance of Eri, who tries to interfere due to her own romantic feelings for Harima.During Yakumo's childhood, her name is often mispronounced by Tenma as "Ya'mo", and Tenma's attempts to become a reliable older sister usually backfire due to her clumsiness much to her annoyance, leading to a short break up between them, until she starts recognizing Tenma's kindness towards her as far more important than any of her older sister's faults.Yakumo finds a stray black cat with an X-shaped scar on its forehead who follows her to school.