Formerly known as Saga Masamune, before his parents divorced in high school. He is the editor-in-chief of the Emerald department at Marukawa, and is sometimes referred to as "the Capable". He and Ritsu were once in a brief relationship in high school but split up over a misunderstanding, where they both thought each other was wrong. It is revealed that he later had a break down from the break up, family problems, and other personal issues, which in turn left him with an unrequited love for Ritsu. When both he and Ritsu realize who each other are, he promises Ritsu he will make him fall in love with him again much to Ritsu's contempt.   

(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.

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__Non-Anime Roles:__
- Altair Ibn La Ahad - Assassin's Creed (VG)
- Gosei Knight - Tensou Sentai Goseiger (Tokusatsu)
- Sakuya - Otori Rewrite (VG)
- Altair Ibn La Ahad - Assassin's Creed Revelations (VG)
- [Walter](https://anilist.co/character/184385/) - Shin Megami Tensei IV (VG)
- Jun Oda - Yakuza 0 (VG)
- Alfred - Bloodborne (VG)
- Olberic Eisenberg - Octopath Traveler (VG)
- Hooded Figure/Beelzebub - Granblue Fantasy (VG)
- [SilverAsh](https://anilist.co/character/175536/) - Arknights (VG)
- Boothill - Honkai: Star Rail (VG)
- Sylus - Love and Deepspace (VG)
- Noctis - Punishing: Gray Raven (VG)
- Shun Kanou - Persona 5: The Phantom X (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)

When Ritsu Onodera changes jobs, looking for a fresh start, he's not exactly thrilled when his new boss turns out to be his old flame. Ritsu's determined to leave all that in the past—but how can he when his boss is just as determined that they have a future?
 
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)

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

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.

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.