Yakumo Tsukamoto is a central character in the anime series 'School Rumble'. She is the younger sister of Tenma Tsukamoto, the series' protagonist. Known for her serene demeanor and intelligence, Yakumo is admired by her peers, though she often keeps to herself. She possesses the unique ability to read people's thoughts when they have romantic feelings towards her. Despite being popular among her classmates, Yakumo's primary focus is supporting her sister, Tenma, and helping her navigate through her comedic and often chaotic romantic pursuits. Her character adds depth and warmth to the series.