Izumi Takanashi (小鳥遊 泉)

Age: 28
Height: 173 cm

Izumi, Souta's second eldest sister, is an author who tends to stay in her room for long periods of time focusing on working while ignoring the cleanliness of herself and her surroundings. She is also really weak. For instance, she crawls around instead of walking because otherwise she would use too much energy.