"Hidarikiki no Eren" centers on Eren, a left-handed high school student who struggles with societal expectations and personal insecurities. In a world where left-handedness is often stigmatized, Eren faces daily challenges, from using right-handed tools to enduring subtle discrimination. The narrative explores Eren's journey of self-acceptance and resilience as he navigates school life, friendships, and familial relationships.

Eren's struggles are compounded by his strained relationship with his father, who disapproves of his left-handedness and pressures him to conform. At school, Eren befriends a diverse group of classmates, including Rina, a confident and supportive peer who encourages him to embrace his uniqueness. Another key character is Takuya, a right-handed student who initially mocks Eren but gradually develops respect for him as they collaborate on a school project.

The plot delves into themes of identity, societal norms, and the importance of individuality. Eren's growth is marked by small victories, such as learning to use left-handed scissors and standing up to bullies. The story also highlights the broader implications of societal biases, as Eren's experiences mirror those of other left-handed individuals in his community.

As the narrative progresses, Eren's journey inspires those around him to challenge their own prejudices and embrace diversity. The series concludes with Eren finding a sense of belonging and pride in his identity, symbolizing the broader message of acceptance and self-empowerment. Through its relatable characters and thoughtful exploration of social issues, "Hidarikiki no Eren" offers a compelling and heartfelt story.