Hatori, also known as Tori, is 28 years old and an editor in the Emerald department. Although in the beginning he is serious and reserved, we later learn that he has harbored both deep and secret feelings for his childhood friend Chiaki. After kissing him and confessing his love, Hatori pulls away fearing that Chiaki doesn't feel the same, but instead loves his rival, Yanase. Although Chiaki does somewhat have the same feelings, unbeknownst to Tori.   (Source: Wikipedia) 

Onodera Ritsu has just transferred from his father's publishing company to Marukawa Shoten. Assigned to the shoujo manga division, he crosses path with the person he'd least expected to meet. Takano Masamune is the editor-in-chief of the division Ritsu's been assigned to, and the two seem get off on the wrong foot right from the very start when Takano unexpectedly kisses him. However, there is more to than what meets the eye: Takano is actually Saga, Ritsu's senpai and high school love, whom Ritsu had thought to have played him for a fool by taking his affections for granted when he confessed and summarily dumped him.

__Height:__ 175 cm

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**Trivia:**
- His nickname "Yuu-kyan" was given by Kenichi Suzumura.
- Very close with Tomokazu Sugita. They host a video game variety show called Tokyo Encounter together.
- Loves cats but is afraid of having them die before him, so doesn't have any of his own.
- Allergic to metals and alcohol; drinks non-alcoholic soft drinks or orange juice at parties.
- Colorblind.

__Non-Anime Roles:__

- Louis Guiabern - Metaphor: ReFantazio (VG)

Movie adaptation of the Sekaiichi Hatsukoi: Yokozawa Takafumi no Baai BL light novel.

Tired of accusations that family connections got him his current position, Ritsu Onodera quits his job as an editor at his father's company and transfers to Marukawa Publishing. Once there, he is assigned to the shojo manga editorial department—something he has no interest in and no experience with! Having sworn he'd never fall in love again, the last thing he wants to do is work on love stories. To make matters worse, it turns out that his overbearing boss, Masamune Takano, is actually his first love from high school! 
 
(Source: SuBLime)

Two OVA episodes featuring additional stories. 
Episode 0: Ritsu and Takano used to date back in high school, but broke up due to a misunderstanding. This is that story. 
Episode 12.5: Hatori and Chiaki go to visit the latter's family. It's really awkward in many, many ways.

Animated short with an original story that was screened alongside "Sekaiichi Hatsukoi Movie: Yokozawa Takafumi no Baai."

Takafumi Yokozawa works at the sales department of the publishing company Marukawa Shoten and is in love with the editor in chief since college but it doesn't seem Yokozawa's feelings will ever be returned but what will happern when publishing company Japun's  editor in chief takes an interest in him?

The popular Shoujo mangaka, Yoshino Chiaki, got confessed by his editor in charge, Hatori Yoshiyuki, who is his childhood friend, they even ended up with more than that.  What will happen to Yoshino who swing between, love, friendship and work...? The fully loaded of know-how publishing industry of love, which turns editors to the extent of pale, unfolds on the stage of publishing company, Marukawashuten.

Continues the relationship previously introduced in Sekaiichi Hatsukoi: The Case of Chiaki Yoshino, but from Yoshiyuki Hatori's perspective. 