Futaba Watanuki, the middle sister among the three Watanuki siblings, is 23 years old and works as an apparel shop clerk. She presents a rough exterior but wields strong communication skills, standing as the most socially adept sister. Others regularly seek her romantic advice, drawing on her relationship experience. Futaba demonstrates expertise in calligraphy and shogi. After both parents died, she resides with older sister Ichika and younger sister Mitsuki in their Tokyo family home. Her interactions involve providing emotional support and practical guidance as the sisters navigate daily challenges. Early episodes featured her in a distinctive black-and-white striped shirt, later altered. Her presence contributes to the family dynamic as they cope with shared loss and rebuild their lives.