Ayaka Kurusugawa is the younger sister of Serika Kurusugawa within the wealthy Kurusugawa family conglomerate, known for advanced technologies including humanoid robotics. Born January 23rd, she stands 161 cm tall with a slim build, pale skin, striking blue eyes, and long blue hair featuring distinctive spiky bangs. Her measurements are 88-56-85 cm. Ayaka typically wears school uniforms: a pleated skirt, formal shirt, vest, necktie, loafers, and knee-high socks, often depicted carrying a sports bag or wearing boxing gloves.

After growing up in New York, Ayaka returned to Japan. Her personality is outgoing, confident, and mischievous, contrasting sharply with her sister's reserved nature, and she possesses a genius-level aptitude in multiple disciplines. Ayaka excels in unarmed combat, specifically mixed martial arts under "Extreme Rules," reigning as the champion of its tournament circuit. This expertise makes her a role model for Aoi Matsubara, another martial artist practicing the same discipline who faces marginalization from traditional communities.

Within "To Heart: Remember My Memories," Ayaka actively trains with Aoi and participates in an MMA tournament, advancing to the finals. She also refereed a match between Aoi and Yoshie in the original "To Heart" series. Despite her privileged background, Ayaka attends a different school than Serika and pursues an independent path, maintaining a strong relationship with her sister. Her narrative centers on her martial arts engagements and mentorship of Aoi.