"I Only Have Six Months to Live" centers on a high school student named Haruto, who is diagnosed with a terminal illness and given only six months to live. Determined to make the most of his remaining time, Haruto decides to live without regrets, embracing experiences he previously avoided. The narrative explores his journey as he reconnects with estranged friends, pursues unfulfilled dreams, and confronts unresolved emotions.

Haruto’s relationships form the core of the story. His childhood friend, Aoi, plays a significant role, offering unwavering support while grappling with her own feelings of guilt and helplessness. Another key character is Riku, a classmate who initially appears aloof but gradually reveals a deeper connection to Haruto’s past. The interactions between these characters highlight themes of friendship, forgiveness, and the importance of cherishing time.

As Haruto’s condition progresses, the story delves into his internal struggles, balancing moments of hope with the harsh reality of his prognosis. Flashbacks provide insight into his past, revealing pivotal moments that shaped his relationships and outlook on life. The narrative also examines how those around him cope with his impending loss, portraying a range of emotional responses from denial to acceptance.

The manga avoids melodrama, instead focusing on the quiet, everyday moments that define Haruto’s final months. It emphasizes the impact of small gestures, such as rekindling old friendships or pursuing a long-forgotten hobby, as Haruto seeks to leave a meaningful legacy. The story’s pacing allows for a gradual exploration of its themes, culminating in a poignant reflection on life, mortality, and the connections that define us.