Kaho Akamatsu serves as Kanami's older sister, employed as a nurse with a habit of rushing through mornings to reach work punctually. She exhibits dark blue hair, brown eyes, and body measurements of 105-59-91. During an elevator encounter with her brother-in-law Youichi, she teased him playfully about treating Kanami well. When the elevator malfunctioned and trapped them, she conducted a physical assessment of his "qualities." By the narrative's conclusion, she is pregnant, alongside Kanami's other sisters and Youichi's stepmother.