"I Think I Turned My Childhood Friend Into a Girl" centers on the relationship between two childhood friends, Hiiragi and Miwa, whose dynamic shifts dramatically after a pivotal event. Hiiragi, a reserved and introspective boy, has always admired Miwa, who is outgoing, confident, and traditionally masculine in appearance and demeanor. One day, Hiiragi impulsively suggests that Miwa try on a dress, sparking a transformation neither of them anticipated. Miwa, intrigued by the experience, begins to explore a more feminine presentation, leading to a gradual shift in their identity and self-expression.

As Miwa embraces this new side of themselves, the story delves into themes of gender identity, self-discovery, and the fluidity of personal expression. Hiiragi, initially unsure how to process these changes, finds himself increasingly drawn to Miwa’s evolving persona. Their relationship becomes a delicate balance of support, curiosity, and growing romantic tension. The narrative explores how both characters navigate their feelings, societal expectations, and the complexities of their bond.

The manga portrays Miwa’s journey with sensitivity, highlighting the challenges and joys of exploring gender identity in a society that often enforces rigid norms. Hiiragi’s perspective provides a lens into the struggles of understanding and accepting change, both in oneself and in others. The story progresses through everyday moments, school life, and interactions with friends, creating a grounded and relatable exploration of identity and relationships.

Supporting characters, such as classmates and family members, add depth to the narrative, offering varying perspectives on Miwa’s transformation and its impact on those around them. The manga avoids sensationalism, instead focusing on the emotional and psychological dimensions of its characters’ experiences. Through its thoughtful storytelling, "I Think I Turned My Childhood Friend Into a Girl" presents a nuanced portrayal of identity, friendship, and love, making it a compelling read for those interested in character-driven narratives and themes of self-discovery.