"Iguana Girl" is a psychological drama manga that explores themes of self-worth, familial relationships, and societal expectations. The story centers on Rika Akiyoshi, a young girl who, from birth, is perceived by her mother, Mako, as resembling an iguana. This perception is not literal but symbolic, reflecting Mako's deep-seated dissatisfaction and rejection of her daughter. Mako's favoritism toward Rika's younger sister, Sayuri, exacerbates Rika's feelings of inadequacy and alienation.

Rika grows up internalizing her mother's disdain, believing herself to be ugly and unworthy of love. Her self-esteem is further eroded by bullying at school and the constant comparison to her sister, who is seen as beautiful and perfect. Despite her struggles, Rika strives to gain her mother's approval, often at great emotional cost. The narrative delves into the psychological impact of Mako's rejection, portraying Rika's journey through childhood and adolescence as she grapples with her identity and self-perception.

As the story progresses, Rika's relationship with her mother remains strained, but she begins to find solace in her friendships and her own resilience. The manga examines the cyclical nature of familial trauma, as Mako's own insecurities and upbringing are revealed to be the root of her harsh treatment of Rika. The dynamic between the characters is complex, with moments of vulnerability and insight that highlight the emotional toll of unmet expectations and conditional love.

"Iguana Girl" is a poignant exploration of the human psyche, offering a nuanced portrayal of the effects of parental rejection and the struggle for self-acceptance. The narrative is both introspective and emotionally charged, presenting a compelling examination of the ways in which individuals navigate the challenges of identity and belonging within the context of family and society.