"Sekai Ichi Hatsukoi - The World’s Greatest First Love" is a romantic drama anime centered around the lives of individuals working in the manga publishing industry, particularly at the fictional publishing company Marukawa Shoten. The narrative intertwines multiple love stories, primarily focusing on the rekindling of a past relationship between Ritsu Onodera and Masamune Takano.

Ritsu Onodera, a talented editor, leaves his family’s publishing company after a failed romantic relationship and joins Marukawa Shoten’s Emerald Department, which specializes in shōjo manga. Unbeknownst to him, his new boss, Masamune Takano, is his high school sweetheart, whom he had forgotten due to a traumatic breakup. Takano, who still harbors deep feelings for Ritsu, recognizes him immediately and resolves to win him back. Their dynamic is marked by tension, unresolved emotions, and Takano’s persistent efforts to break through Ritsu’s emotional barriers.

The series also explores the relationships of other characters within the same workplace. Yoshiyuki Hatori, a senior editor, and Chiaki Yoshino, a rookie manga editor, share a complicated history. Hatori, who is openly gay, harbors unrequited feelings for Yoshino, who is initially unaware of Hatori’s feelings and struggles with his own identity and societal expectations. Their story delves into themes of self-discovery and the challenges of navigating romantic feelings in a professional environment.

Another subplot involves Shōta Kisa, a reserved and introverted editor, and Yukina Kōsaka, a popular and outgoing manga artist. Kisa’s quiet demeanor contrasts with Kōsaka’s flamboyant personality, creating an intriguing dynamic as their relationship evolves from professional to personal. The series also touches on the lives of other colleagues, such as the playful and supportive editor Yū Yanase and his interactions with the manga artist Ryōya Hashimoto.

The anime balances workplace drama with romantic development, highlighting the challenges of maintaining professional boundaries while exploring personal relationships. It portrays the struggles of its characters as they confront their pasts, navigate their emotions, and strive for happiness in both their careers and love lives. The setting within the manga industry provides a unique backdrop, offering insights into the creative and editorial processes while emphasizing the human connections that drive the characters’ stories.