Erika Amano, a teenage girl with long reddish-blond hair often tied in pigtails with brown ribbons or braided, sports striking purple eyes and red pearl stud earrings. Her school attire shifts from a brown sailor uniform to a blazer after photos with Nagi Umino surface. Born to the Umine family but raised by wealthy hoteliers Souichirou and Ritsuko Amano due to a hospital mix-up, her engagement to Nagi bridges both families. Initially carefree and somewhat spoiled, Erika resists dependence but gradually softens toward Nagi, enlisting him as a fake boyfriend to dodge their arranged marriage. Forced cohabitation deepens their bond, sparking mutual feelings that culminate in a kiss and confessions. Tensions arise when Nagi dates Hiro Segawa, prompting Erika’s withdrawal. She nurtures a bond with biological sister Sachi Umino, who transitions from dislike to affection. She befriends Hiro Segawa, an Instagram admirer turned study companion, and navigates jealousy toward Ai Mochizuki before respecting her talents. Her past includes a complex quest for Sousuke Amano, Nagi’s brother, once the object of her affections and Instagram searches. An avid photographer, Erika adores dinosaurs, prefers thin-crust pizza, and reveres smartphone inventors. As an Aries, her personality intertwines creativity, specific passions, and an evolving emotional journey through relationships and self-discovery.