is Rikka Takanashi's elder sister. She lived one floor above Yuuta Togashi for quite some time. She is allergic to cats, which later forces Yuuta to keep Rikka's cat. She gets frustrated when Rikka is too obsessed with her delusions. She often arrives home late due to her work as a chef in a famous restaurant. Due to being a gymnast back in high school she is still extremely flexible as evident throughout the series.