Also known as: 五十嵐双葉
Main character of Senpai Ga Uzai Kouhai No Hanashi, the "kouhai" of the story.
She is a Petite Office Lady with a quick temper. While she's easy to set off, Futaba has her cute and kind side which is hidden by her thick "Tsundere hide", especially towards her senior, Takeda Harumi. Due to her appearance, she's often confused for a middle-school student or someone's daughter. Skilled at cooking, particularly around home-style meals.
She has Green Eyes and Green Hair tied in a Ponytail along with chin-long Sidelocks. Often seen with a Fang and Sharp Teeth when annoyed.