Sekai Ichi Hatsukoi - The World's Greatest First Love

Ritsu Onodera hated the fact that people claimed he only got into his father's company because he was the son and promptly quits. He starts his new job at Marukawa Publishing house but ends up in a department for shojo manga, something he's neither interested nor experienced in. To make matters worse, the first impression he gets from the high handed editor in chief Masamune Takano is terrible...

The Emerald Editing team has started the task of releasing a magazine. Ritsu Onodera, a rookie shojo manga editor, is forced to go to the office of an author with the editor in chief, Masamune Takano. However, when Ritsu sees the author panic because of the looming deadline, he accidentally...?!

Ritsu can't calm down after finding out Takano's true identity. On top of that, when he's about to immerse himself in the work for the author he's in charge for, he encounters Takafumi Yokozawa, the wild horse of the sales department. He makes a terrible first impression on Ritsu by accusing him of "riding [his] father's coat tails". To top it off, he seems to be quite friendly with Takano in...

Late at night, Ritsu has a run in with Yokozawa at Takano's apartment. He tries to stay calm, but the confusion and agitation have him too rattled. Then one day, it becomes apparent that the manuscript of one of the author's Ritsu is responsible for won't make it for the printing deadline. Yokozawa suggests to "drop it this time". However, when Ritsu insists that he wants to get it in, T...

Chiaki Yoshino is a popular shoujo manga author under the pen name "Chiharu Yoshikawa". His friends include his childhood friend and editor Yoshiyuki Hatori, and the chief assistant Yuu Yanase they know since middle school. But one day, Yoshino happens to witness Hatori and Yanase kiss...

Yoshino's childhood friend and editor Hatori confesses his love to him. But Yoshino suspects that his friend and chief assistant Yanase is actually secretly in love with Hatori. Yoshino's so preoccupied with the relationship between those two that he can't focus on his work...

Ritsu is having trouble writing up the proposal for his first manga project. Amidst his trouble, Takano's friend from the sales department, Yokozawa, declares that "Masamune is mine". Ritsu can't hide that he's shaken, but then he runs into Takano at a bar he ended up with his friend...

Kisa has a crush on one of the staff members at the book store he frequents. He silently watches until Yokozawa forces an introduction.

Kisa can't concentrate on his work due to not being able to keep Yukina out of his mind. He tries to convince himself that he's only visiting the store to check out the comic display that Yukina made for him; however, the fact that Yukina isn't acting any different confuses him.

Right after Yoshino announces that he is going to a hot spring resort with his chief assistant and friend Yanase, Hatori says "Do you even remember what's on that day?". While he is still confused, Hatori throws him out of his apartment. Yoshino does not understand Hatori's problem and indignantly goes to the hot springs with Yanase, but...

One day Ritsu Onodera runs into the author Ryouichi Sumi who he had worked with at his old company. Ritsu also gets introduced to Ryouichi Sumi's new editor and gets in contact with the literary world again after a long hiatus, but...

Meeting Ryouichi Sumi and the advice from Hasegawa have put doubt into Ritsu Onodera's heart. He remembers the reason he transferred to Marukawa and wonders if he can continue to work as a manga editor. While he is struggling, Takano asks him if he wants transfer to the literature department and...