28 years old. Studied with Takano at the same college. Helped him to get through the hard period of his life. They slept twice but never went out. Yokozawa took Takano's cat away from him, saying that a person that can't take care of himself has no right to keep a pet. However later on the cat got used to Yokozawa and stayed with him.  Yokozawa's been in love with Takano since college days, even having erased the latter's while phone book and left only his number there after their first night together. He honestly worries about Masamune and despises Onodera for hurting him and trying to get close to him again.  ~!Later on Masamune tells him that the one he loves is Onodera and tells him not to stick his nose into Masamune's love life. This frustrates Yokozawa who exclaims that he's the only one who knows everything about him, he was with Masamune during his most difficult years, and yet why does he love Onodera? Masamune only says that that's how it is. Yokozawa calms down and says that he still wants to work with him and be friends with him, but he needs time. Takano apologizes to him. Later on Yokozawa seems to change his attitude towards Onodera even trying to praise him for his work. However he says that if Onodera ever dares to hurt Masamune, Yokozawa will take him back.!~  Works at the sales department of Marukawa Shoten. His temper has earned him a nickname "wild horse". He's a professional and is valued at the company. According to Hatori it's all thanks to Yokozawa that Takano got a job transfer to Marukawa.  Despite his bad temper and attitude he works hard and takes pride in his company. He also seems to love cats. This love is mutual. Makes Onodera think that Yokozawa might actually be a kind person.

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.

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!<br>
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(Source: SuBLime)

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?