Yakumo Tsukamoto is a soft spoken girl, also referred to by Harima Kenji as Imouto-san/Tenma's sister, carries a strong presence with her wherever she goes. She can hear the thoughts of people who have strong feelings for her and is a member of the Tea Club. She also works at Cafe Mercado. Yakumo makes her debut appearance in chapter 1 of the manga (Episode 1 in the anime). Her picture appears on the cover of Volume 2. She is also the featured character of the second image album.